Search results
SQL Cheat Sheet. The SQL cheat sheet provides you with the most commonly used SQL statements for your reference. You can download the SQL cheat sheet as follows: Download 3-page SQL cheat sheet in PDF format. Querying data from a table. Query data in columns c1, c2 from a table. SELECT c1, c2 FROM t;
1 cze 2021 · SELECT COUNT(*) FROM city; To get the number of non-NULL values in a column: SELECT COUNT(rating) FROM city; To get the count of unique values in a column: SELECT COUNT(DISTINCT Hcountry_id) FROM city; GROUP BY. CITY
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.
25 mar 2021 · What is a Database? Before we get started with SQL Cheat Sheet, we need to understand what a database is and why do we need SQL. If you want to learn this offline, you can download the SQL basics cheat sheet at any time. Data is a collection of facts related to any object.
1 cze 2021 · Get the count of characters in a string: SELECT LENGTH('LearnSQL.com'); -- result: 12. Convert all letters to lowercase: SELECT LOWER('LEARNSQL.COM'); -- result: learnsql.com. Convert all letters to uppercase: SELECT UPPER('LearnSQL.com'); -- result: LEARNSQL.COM.
15 lis 2023 · The COUNT command counts the number of rows or non-null values in a specified column.
SELECT DISTINCT. column FROM table; WHERE column LIKE 'text'; (or NOT LIKE) WHERE column condition1 AND column condit‐ion2; WHERE column condition1 OR column condit‐ion2; WHERE column BETWEEN 'A' AND 'B'; Operator used in a WHERE clause to filter the result set within a certain range (numbers, text, or dates).
