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15 wrz 2008 · How do I perform an IF...THEN in an SQL SELECT statement? For example: The CASE statement is the closest to IF in SQL and is supported on all versions of SQL Server. CASE. WHEN Obsolete = 'N' or InStock = 'Y' THEN 1. ELSE 0. END AS bit) as Saleable, * You only need to use the CAST operator if you want the result as a Boolean value.
7 gru 2023 · With a simple case you can check if an input equals any listed key. If it does you can return a corresponding value. This structure of this is: If the <selector> matches none of the clauses, if you have an else clause it returns <else_value>. Otherwise it returns <null>. For example, to map exam ids to names according to these rules:
A CASE expression can return a column. So you can create "dynamic" where clauses which return a different column based on an input value. For example, the value of RES_TYPE determines whether you're searching for a grade A-F or a pass/fail outcome. This is hard to debug so is best avoided.
Summary: in this tutorial, you will learn how to use the PL/SQL IF statement to either execute or skip a sequence of statements based on a specified condition. The IF statement allows you to either execute or skip a sequence of statements, depending on a condition. The IF statement has three forms:
Oracle® PL/SQL by Example, Sixth Edition, presents the Oracle PL/SQL programming language in a unique and highly effective format. It challenges you to learn Oracle PL/SQL by using it rather than by simply reading about it.
The IF statement either runs or skips a sequence of one or more statements, depending on the value of a BOOLEAN expression. ( boolean_expression ::= , statement ::= ) Expression whose value is TRUE, FALSE, or NULL. The first boolean_expression is always evaluated.
This Oracle tutorial explains how to use the IF-THEN-ELSE statement in Oracle with syntax and examples. In Oracle, the IF-THEN-ELSE statement is used to execute code when a condition is TRUE, or execute different code if the condition evaluates to FALSE.
