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Tutorial. SQL is a standard language for storing, manipulating and retrieving data in databases. Our SQL tutorial will teach you how to use SQL in: MySQL, SQL Server, MS Access, Oracle, Sybase, Informix, Postgres, and other database systems.
Whether you need a quick reference for major SQL concepts before an interview, or you want to level-up your existing SQL skills, our SQL cheat sheet is the ideal starting point. Plus, we’ve broken it down into 11 essential SQL topics to help you get the most from this SQL query cheat sheet.
1 cze 2021 · Fetch all names that start with any letter followed by 'atherine': SELECT name FROM names WHERE name LIKE '_atherine'; Fetch all names that end with 'a': SELECT name FROM names WHERE name LIKE '%a'; USEFUL FUNCTIONS. Get the count of characters in a string: SELECT LENGTH('LearnSQL.com');-- result: 12 Convert all letters to lowercase: SELECT ...
BEGIN--do what needs to be done if exists END ELSE BEGIN--do what needs to be done if not END: GROUP BY: SELECT column_name, aggregate_function(column_name) FROM table_name WHERE column_name operator value GROUP BY column_name: HAVING: SELECT column_name, aggregate_function(column_name) FROM table_name WHERE column_name operator value GROUP BY ...
18 kwi 2024 · Getting Started with SQL Basic Commands. SQL Server Tables and Views. Additional T-SQL Commands for SQL Databases. FROM and JOIN Commands in MS SQL Server. T-SQL WHERE Clause Logic. Order By, Group By, and Having T-SQL Commands. Intermediate and Advanced T-SQL Commands. Next Steps.
25 sie 2021 · This comprehensive cheat sheet is packed with syntax for different text and numeric functions, CASE WHEN statements, handling NULL, date and time types, INTERVALs, and aggregate functions. It also features a troubleshooting section to help you navigate through common issues seamlessly.
1 cze 2021 · Standard SQL Functions Cheat Sheet. TEXT FUNCTIONS. CONCATENATION. Use the || operator to concatenate two strings: SELECT 'Hi ' || 'there!'; -- result: Hi there! Remember that you can concatenate only character strings using. ||. Use this trick for numbers: SELECT '' || 4 || 2;
