在SQL语句中使用IF或CASE with multiple条件的作用是根据不同的条件执行不同的操作或返回不同的结果。这些条件可以是基于列的值、函数的结果、逻辑表达式等。 使用IF语句可以根据条件执行不同的操作。IF语句的基本语法如下: 代码语言:txt 复制 IF condition THEN statement1; ELSE statement2; END IF; 其中,conditio...
SELECTcolumn1, column2, ...CASEWHENcondition1THENresult1WHENcondition2THENresult2-- Add more WHEN conditions and results as neededENDASalias_nameFROMtable_name; We can add as manyWHEN ... THENconditions as required in theCASEstatement. For example, -- multiple CASE conditions in SQLSELECTcusto...
This tutorial mainly focuses on building a nested case statement in conjunction with the WHEN clauses. Nested CASE WHEN Statements In SQL, we can use a set of nested CASE WHEN statements in SQL to evaluate the multiple conditions and return a different result based on the defined conditions. ...
With the searched CASE expression, we can have multiple WHEN conditions: SELECT [BusinessEntityID],[JobTitle],[HireDate],Seniority=CASE WHENDATEDIFF(YEAR,[HireDate],GETDATE())>10 THEN'Longer than 10 years'WHENDATEDIFF(YEAR,[HireDate],GETDATE())=10 THEN'Exactly 10 years'WHENDATEDIFF(YEAR,[...
将其 Package 在MAX中，以便将组中多行的值（包括NULL）"压缩"/聚合为单个值;如果所有的行都有NULL...
SQL WITHData(value)AS(SELECT0UNIONALLSELECT1)SELECTCASEWHENMIN(value) <=0THEN0WHENMAX(1/value) >=100THEN1ENDFROMData; GO You should only depend on order of evaluation of the WHEN conditions for scalar expressions (including non-correlated subqueries that return scalars), not for aggregate exp...
WHEN value2 THEN result2 ... ELSE default_result END; Searched CASE Unlike the Simple CASE that evaluates a single expression against multiple values, the Searched CASE evaluates multiple conditions. Its structure is: CASE WHEN condition1 THEN result1 WHEN condition2 THEN result2 ... ELSE defau...
WHEN 'Ar' THEN 'FL' WHEN 'GE' THEN 'AL' ELSE 'IN' END In the following output, you can see old Statcode (left-hand side) and updated Statecode for the employees based on our conditions in the Case statement. Insert statement with CASE statement We can insert data into SQL ta...
SQL CASE statement with Multiple THEN's I am wondering whether its possible to extract two seperate columns of data after a 'THEN' statement when using CASEFor exampleSelect country, CASE WHEN X>1 Then (code which allows 'A' in one column and 'B' in a second column)... END FROM ...
is always the equality operator. Whereas with the searched CASE expression each WHEN clause will contain a “Boolean_expression”. This “Boolean_expression” can be a simple Boolean expression with a single operator, or a complex Boolean expression with many different conditions. In addition, the...