In Oracle, the case statement is used to compare the expression result with several provided foreseeable results. If the comparison is successful, the corresponding statement sequence is executed. The syntax is "CASE expression WHEN expression result 1 THEN executable [WHEN expression result 2 THEN executable]...".
The operating environment of this tutorial: Windows 10 system, Oracle version 12c, Dell G3 computer.
How to use case in oracle
This statement can compare the expression result with several foreseeable results provided. If the comparison is successful, the corresponding statement sequence will be executed. The syntax is " CASE expression WHEN expression result 1 THEN execution item [WHEN expression result 2 THEN execution item]...".
There are case statements in oracle
case statements can be divided into two types:
One is a simple case statement, which gives a Expression, and compares the expression result with several provided predictable results. If the comparison is successful, the corresponding statement sequence is executed.
The other is the search-style case statement. It will provide multiple Boolean expressions, then select the first expression that is true and execute the corresponding script.
1. Simple case statement
Syntax:
case exp when comexp then returnvalue … when comexp then returnvalue else returnvalue end
The period from case to end is equivalent to a specific value, which can be used for calculations and aliases , nested cases, etc.
Just treat case to end as an expression of the operation result.
Example:
2. Search case statement
Grammar:
case when boolean then return value … when boolean then return value else retur nvalue end
Example :
The difference between simple case and search case:
Simple case can only be when The following expression completely matches the expression after the case, which is equivalent to =, so it cannot match null.
searched case can be used as a comparison condition, then you can use like, !=, between...and,
Recommended tutorial: "Oracle Video Tutorial"
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