{"id":194621,"date":"2025-03-17T06:30:00","date_gmt":"2025-03-17T05:30:00","guid":{"rendered":"https:\/\/datascientest.com\/en\/?p=194621"},"modified":"2025-03-14T14:08:13","modified_gmt":"2025-03-14T13:08:13","slug":"sql-aliases-all-about","status":"publish","type":"post","link":"https:\/\/datascientest.com\/en\/sql-aliases-all-about","title":{"rendered":"SQL Aliases: Simplify Your Queries"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"194621\" class=\"elementor elementor-194621\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-b2390ec e-flex e-con-boxed e-con\" data-id=\"b2390ec\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-76b47eb elementor-widget elementor-widget-text-editor\" data-id=\"76b47eb\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<style>\/*! elementor - v3.15.0 - 02-08-2023 *\/\n.elementor-widget-text-editor.elementor-drop-cap-view-stacked .elementor-drop-cap{background-color:#69727d;color:#fff}.elementor-widget-text-editor.elementor-drop-cap-view-framed .elementor-drop-cap{color:#69727d;border:3px solid;background-color:transparent}.elementor-widget-text-editor:not(.elementor-drop-cap-view-default) .elementor-drop-cap{margin-top:8px}.elementor-widget-text-editor:not(.elementor-drop-cap-view-default) .elementor-drop-cap-letter{width:1em;height:1em}.elementor-widget-text-editor .elementor-drop-cap{float:left;text-align:center;line-height:1;font-size:50px}.elementor-widget-text-editor .elementor-drop-cap-letter{display:inline-block}<\/style>\t\t\t\t<p><strong>Have you ever read a <a href=\"https:\/\/datascientest.com\/en\/sql-queries-the-5-most-important-commands-to-know\">SQL query<\/a> with tons of subqueries and felt lost? Have you been in a situation where you found a SQL query hard to interpret and did not even know where to start? Spoiler: I have! This nightmare can be caused by a wide variety of reasons, and today, I am going to share with you one of them: table aliases.<\/strong><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-13afee5 e-flex e-con-boxed e-con\" data-id=\"13afee5\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-1518b1f elementor-widget elementor-widget-heading\" data-id=\"1518b1f\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<style>\/*! elementor - v3.15.0 - 02-08-2023 *\/\n.elementor-heading-title{padding:0;margin:0;line-height:1}.elementor-widget-heading .elementor-heading-title[class*=elementor-size-]>a{color:inherit;font-size:inherit;line-height:inherit}.elementor-widget-heading .elementor-heading-title.elementor-size-small{font-size:15px}.elementor-widget-heading .elementor-heading-title.elementor-size-medium{font-size:19px}.elementor-widget-heading .elementor-heading-title.elementor-size-large{font-size:29px}.elementor-widget-heading .elementor-heading-title.elementor-size-xl{font-size:39px}.elementor-widget-heading .elementor-heading-title.elementor-size-xxl{font-size:59px}<\/style><h2 class=\"elementor-heading-title elementor-size-xl\">What Are Aliases?<\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0670d94 elementor-widget elementor-widget-text-editor\" data-id=\"0670d94\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">Aliases can be helpful when you have long table names and do not want to repeat them again and again in your query. Imagine that you have tables called <\/span><strong>red_wine_sales_performance<\/strong><span style=\"font-weight: 400;\"> and <\/span><strong>white_wine_sales_performance<\/strong><span style=\"font-weight: 400;\">. In each of them, you have columns like wine brands and their monthly sales figures. You want to compare the red wine and white wine sales performance, so in your query, you will have to do this:<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-fdb915e elementor-widget elementor-widget-text-editor\" data-id=\"fdb915e\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<pre><span style=\"font-weight: 400;\">SELECT white_wine_sales_performance.brand, white_wine_sales_performance.monthly_revenue<\/span><br \/><span style=\"font-weight: 400;\">FROM white_wine_sales_performance<\/span><br \/><span style=\"font-weight: 400;\">UNION<\/span><br \/><span style=\"font-weight: 400;\">SELECT red_wine_sales_performance.brand, red_wine_sales_performance.monthly_revenue<\/span><br \/><span style=\"font-weight: 400;\">FROM red_wine_sales_performance;<\/span><\/pre>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-46b3488 elementor-widget elementor-widget-image\" data-id=\"46b3488\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<style>\/*! elementor - v3.15.0 - 02-08-2023 *\/\n.elementor-widget-image{text-align:center}.elementor-widget-image a{display:inline-block}.elementor-widget-image a img[src$=\".svg\"]{width:48px}.elementor-widget-image img{vertical-align:middle;display:inline-block}<\/style>\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"1000\" height=\"571\" src=\"https:\/\/datascientest.com\/en\/files\/2025\/03\/SQL-Aliases-DataScientest-1.webp\" class=\"attachment-full size-full wp-image-194651\" alt=\"\" srcset=\"https:\/\/datascientest.com\/en\/files\/2025\/03\/SQL-Aliases-DataScientest-1.webp 1000w, https:\/\/datascientest.com\/en\/files\/2025\/03\/SQL-Aliases-DataScientest-1-300x171.webp 300w, https:\/\/datascientest.com\/en\/files\/2025\/03\/SQL-Aliases-DataScientest-1-768x439.webp 768w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2339711 elementor-align-center button-principal elementor-widget elementor-widget-button\" data-id=\"2339711\" data-element_type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/datascientest.com\/en\/sql-learn-all-about-the-programming-language-for-databases\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t<span class=\"elementor-button-text\">More about SQL<\/span>\n\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1fe33f5 elementor-widget elementor-widget-text-editor\" data-id=\"1fe33f5\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">I hope you are not overwhelmed at this point. With repeating <strong>table names<\/strong>, your query can be difficult to read. Here\u2019s where aliases come in:<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5268238 elementor-widget elementor-widget-text-editor\" data-id=\"5268238\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<pre><span style=\"font-weight: 400;\">SELECT <\/span><span style=\"color: #339966;\"><b>w<\/b><\/span><span style=\"font-weight: 400;\">.brand, <\/span><span style=\"color: #339966;\"><b>w<\/b><\/span><span style=\"font-weight: 400;\">.monthly_revenue<\/span><br \/><span style=\"font-weight: 400;\">FROM white_wine_sales_performance <\/span><span style=\"color: #339966;\"><b>w<\/b><\/span><br \/><span style=\"font-weight: 400;\">UNION<\/span><br \/><span style=\"font-weight: 400;\">SELECT <\/span><span style=\"color: #ff0000;\"><b>r<\/b><\/span><span style=\"font-weight: 400;\">.brand, <\/span><span style=\"color: #ff0000;\"><b>r<\/b><\/span><span style=\"font-weight: 400;\">.monthly_revenue<\/span><br \/><span style=\"font-weight: 400;\">FROM red_wine_sales_performance <\/span><span style=\"color: #ff0000;\"><b>r<\/b><\/span><span style=\"font-weight: 400;\">;<\/span><\/pre>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c789431 elementor-widget elementor-widget-text-editor\" data-id=\"c789431\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">The difference is immediately noticeable. Aliases help shorten your query by allowing you to use a simple nickname for your tables. This improves readability and efficiency when <strong>writing or debugging SQL scripts<\/strong>.<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ee09d73 elementor-align-center button-principal elementor-widget elementor-widget-button\" data-id=\"ee09d73\" data-element_type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/datascientest.com\/en\/data-scientist-course\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t<span class=\"elementor-button-text\">Master SQL Aliases<\/span>\n\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-e09f32c e-flex e-con-boxed e-con\" data-id=\"e09f32c\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-95cea10 elementor-widget elementor-widget-heading\" data-id=\"95cea10\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h2 class=\"elementor-heading-title elementor-size-xl\">Best Practices for Using Aliases<\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9af1d72 elementor-widget elementor-widget-text-editor\" data-id=\"9af1d72\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<span style=\"font-weight: 400;\">At the end of the day, your script may contain numerous tables serving different purposes. While table aliases can help simplify your query, it is important to use them carefully. Here are some best practices to follow:<\/span>\n<ol>\n \t<li><b>Avoid Reserved Words<\/b><b>\n<\/b><span style=\"font-weight: 400;\">SQL databases have a list of reserved words that should not be used as aliases. For example, in Microsoft Transact-SQL, words like <\/span><span style=\"font-weight: 400; color: #339966;\">EXTERNAL<\/span><span style=\"font-weight: 400;\">, <\/span><span style=\"font-weight: 400; color: #339966;\">RULE<\/span><span style=\"font-weight: 400;\">, and <\/span><span style=\"font-weight: 400; color: #339966;\">GROUP<\/span><span style=\"font-weight: 400;\"> are reserved. The complete list can be found in the official SQL documentation. Different SQL providers may have different restrictions, so checking the official reference before using an alias is a good practice.<\/span><\/li>\n \t<li><b>Use Meaningful Aliases<\/b><b>\n<\/b><span style=\"font-weight: 400;\">A common convention is to use the first letter of each table name as an alias, such as <\/span><span style=\"font-weight: 400; color: #339966;\">w<\/span><span style=\"font-weight: 400;\"> for <\/span><span style=\"font-weight: 400; color: #339966;\">white_wine_sales_performance<\/span><span style=\"font-weight: 400;\"> and <\/span><span style=\"font-weight: 400; color: #339966;\">r<\/span><span style=\"font-weight: 400;\"> for <\/span><span style=\"font-weight: 400; color: #339966;\">red_wine_sales_performance<\/span><span style=\"font-weight: 400;\">. However, if multiple tables start with the same letter, you should consider more descriptive aliases. For example, <\/span><span style=\"font-weight: 400; color: #339966;\">wine<\/span><span style=\"font-weight: 400;\"> for <\/span><span style=\"font-weight: 400; color: #339966;\">wine_sales_performance<\/span><span style=\"font-weight: 400;\"> and <\/span><span style=\"font-weight: 400; color: #339966;\">wheat<\/span><span style=\"font-weight: 400;\"> for <\/span><span style=\"font-weight: 400; color: #339966;\">wheat_sales_performance<\/span><span style=\"font-weight: 400;\"> would be clearer.<\/span><\/li>\n \t<li><b>Prioritize Clarity Over Creativity<\/b><b>\n<\/b><span style=\"font-weight: 400;\">While it may be tempting to use aliases like <\/span><span style=\"font-weight: 400; color: #339966;\">HAHA<\/span><span style=\"font-weight: 400;\"> or <\/span><span style=\"font-weight: 400; color: #339966;\">HEHE<\/span><span style=\"font-weight: 400;\">, doing so can lead to confusion, even for the person who wrote the query. Instead, choose aliases that provide a clear reference to the table\u2019s content to ensure that anyone reviewing or modifying the script can quickly understand it.<\/span><\/li>\n<\/ol>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9535c86 elementor-widget elementor-widget-image\" data-id=\"9535c86\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"1000\" height=\"571\" src=\"https:\/\/datascientest.com\/en\/files\/2025\/03\/SQL-Aliases-DataScientest-2.webp\" class=\"attachment-full size-full wp-image-194655\" alt=\"\" srcset=\"https:\/\/datascientest.com\/en\/files\/2025\/03\/SQL-Aliases-DataScientest-2.webp 1000w, https:\/\/datascientest.com\/en\/files\/2025\/03\/SQL-Aliases-DataScientest-2-300x171.webp 300w, https:\/\/datascientest.com\/en\/files\/2025\/03\/SQL-Aliases-DataScientest-2-768x439.webp 768w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-685e6cd e-flex e-con-boxed e-con\" data-id=\"685e6cd\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-a079c1d elementor-widget elementor-widget-heading\" data-id=\"a079c1d\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h2 class=\"elementor-heading-title elementor-size-xl\">Conclusion<\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ae57781 elementor-widget elementor-widget-text-editor\" data-id=\"ae57781\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">Aliases are a powerful feature in <a href=\"https:\/\/datascientest.com\/en\/all-about-sql3\">SQL<\/a> that can significantly <strong>enhance the readability and maintainability of your queries<\/strong>. By using aliases wisely, you can simplify complex queries, reduce redundancy, and improve efficiency. However, it is essential to follow best practices\u2014avoiding reserved words, using meaningful names, and prioritizing clarity\u2014to ensure that your scripts remain understandable and professional.<\/span><\/p><p><span style=\"font-weight: 400;\">In real-world applications, well-structured queries are <strong>crucial for collaboration and debugging<\/strong>. A good aliasing strategy can make your SQL code more intuitive, allowing team members to interpret and modify queries effortlessly. Whether you are working on small scripts or large-scale database operations, taking the time to apply thoughtful aliasing techniques will ultimately save time and reduce potential errors in your <strong>SQL development process<\/strong>.<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1ab5b48 elementor-align-center button-principal elementor-widget elementor-widget-button\" data-id=\"1ab5b48\" data-element_type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/datascientest.com\/en\/data-scientist-course\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t<span class=\"elementor-button-text\">Start learning SQL<\/span>\n\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-5387fce e-flex e-con-boxed e-con\" data-id=\"5387fce\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-e720b5c elementor-widget elementor-widget-html\" data-id=\"e720b5c\" data-element_type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<script type=\"application\/ld+json\">\r\n{\r\n  \"@context\": \"https:\/\/schema.org\",\r\n  \"@type\": \"FAQPage\",\r\n  \"mainEntity\": [\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"What is an alias in SQL?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"An alias in SQL is a temporary name assigned to a column or a table in a query. It helps make the results more readable and simplifies the writing of complex queries.\"\r\n      }\r\n    },\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"How do you create an alias for a column in SQL?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"To assign an alias to a column, use the 'AS' keyword. Example: SELECT name AS Customer_Name FROM customers; Here, the 'name' column is displayed under the alias 'Customer_Name'.\"\r\n      }\r\n    },\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"Can you assign an alias to a table in SQL?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"Yes, an alias can be used for a table to shorten queries. Example: SELECT c.name FROM customers AS c; Here, 'customers' is temporarily renamed as 'c'.\"\r\n      }\r\n    },\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"Is an SQL alias permanent?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"No, an SQL alias is temporary and does not modify the database structure. It is only valid during the execution of the query.\"\r\n      }\r\n    }\r\n  ]\r\n}\r\n<\/script>\r\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Have you ever read a SQL query with tons of subqueries and felt lost? Have you been in a situation where you found a SQL query hard to interpret and did not even know where to start? Spoiler: I have! This nightmare can be caused by a wide variety of reasons, and today, I am [&hellip;]<\/p>\n","protected":false},"author":99,"featured_media":194623,"comment_status":"open","ping_status":"open","sticky":false,"template":"elementor_theme","format":"standard","meta":{"content-type":"","inline_featured_image":false},"categories":[2425],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.7 (Yoast SEO v21.7) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>SQL Aliases: Simplify Your Queries<\/title>\n<meta name=\"description\" content=\"Learn how SQL Aliases improve query readability and efficiency by assigning temporary names to tables or columns. Simplify complex queries with clear, concise aliases. Explore syntax, examples, and best practices!\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/datascientest.com\/en\/sql-aliases-all-about\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"SQL Aliases: Simplify Your Queries\" \/>\n<meta property=\"og:description\" content=\"Have you ever read a SQL query with tons of subqueries and felt lost? 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