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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;
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; -- result: 42.
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 ...
This 3-page SQL Cheat Sheet provides you with the most commonly used SQL statements. Download the SQL cheat sheet, print it out, and stick to your desk.
SQL CHEAT SHEET SQL GROUP BY The GROUP BY clause is usually used with an aggregate function (COUNT, SUM, AVG, MIN, MAX). It groups the rows by a given column value (specified after GROUP BY) then calculates the aggregate for each group and returns that to the screen. SELECT column1, COUNT(column2) FROM table_name GROUP BY column1;
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.
2 wrz 2024 · In this guide, we will see a comprehensive cheat sheet for essential SQL operations, offering a practical reference for tasks ranging from database creation to advanced data handling techniques.
