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10 sty 2012 · It has to do with the Normal Form for the SQL language. IF statements can, by definition, only take a single SQL statement. However, there is a special kind of SQL statement which can contain multiple SQL statements, the BEGIN-END block.
12 wrz 2022 · Learn how to build conditional logic when writing SQL code using IF, BEGIN, END, ELSE, and ELSEIF logic.
24 maj 2021 · The IF…ELSE structure will execute a certain block of code if a specified condition is TRUE, and a different block of code if that condition is FALSE. Here is the basic layout and syntax of the IF…ELSE structure: IF(<condition is true>) BEGIN. <execute some code>.
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.
The IF ELSE statement. When the condition in the IF clause evaluates to FALSE and you want to execute another statement block, you can use the ELSE clause. The following illustrates the IF ELSE statement: IF Boolean_expression.
2 cze 2023 · The SQL CASE statement allows you to perform IF-THEN-ELSE functionality within an SQL statement. Learn more about this powerful statement in this article. This article applies to Oracle, SQL Server, MySQL, and PostgreSQL.
SQL Examples. Learn by examples! This tutorial supplements all explanations with clarifying examples. See All SQL Examples. SQL Quiz Test. Test your SQL skills at W3Schools! Start SQL Quiz! My Learning. Track your progress with the free "My Learning" program here at W3Schools. Log in to your account, and start earning points!
