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,condit...
At a high-level, the syntax for a SQL CASE statement is shown below. Here, we specified multiple conditions. SQL Server evaluates the conditions sequentially. Once a condition evaluates successfully, it stops the evaluation of remaining conditions. If none of the conditions are satisfied, we can...
下面的 sql 语句是要将 status 列根据一个条件或者多条件转换为对应的值. 其中要注意 case 关键字后面...
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...
Amazon Redshift SQL SQL functions reference PDFRSS The CASE expression is a conditional expression, similar to if/then/else statements found in other languages. CASE is used to specify a result when there are multiple conditions. Use CASE where a SQL expression is valid, such as in a SELECT...
PostgreSQLCASEs can have multiple conditions. There are a handful of entries in the table where the name of country and capital is the same. You can add this to your previously constructedCASE- SELECTname,continent,indep_year,CASEWHEN(indep_year<1900)AND(countries.name=countries.capital)THEN'bef...
Transact-SQL reference for the CASE expression. CASE evaluates a list of conditions to return specific results.
Transact-SQL reference for the CASE expression. CASE evaluates a list of conditions to return specific results.
Variables (Transact-SQL) XML Statements (Transact-SQL) Save Add to Collections Add to Plan Share via Facebookx.comLinkedInEmail Print Article 02/24/2014 In this article Syntax Arguments Return Types Remarks Show 2 more Evaluates a list of conditions and returns one of multiple possible result ...
By reviewing the output in Result 2 you can see that when the year of theOrderDTin theMyOrdertable doesn’t meet any of the WHEN clause conditions SQL Server displays “NULL” for the YearType value for that row. 通过检查结果2中的输出,您可以看到,当MyOrder表中的OrderDT年不满足任何when子...