In the T-SQL scripting language, you can use the SQL CASE statement to evaluate a condition and return one or more result expressions. This SQL Tutorial will teach you when and how you can use CASE in T-SQL statements. Solution TheCASE expressionis used to build IF … THEN … ELSE stat...
SQL中的CASE WHEN使用 Case具有两种格式。简单Case函数和Case搜索函数。...简单Case函数的写法相对比较简洁,但是和Case搜索函数相比,功能方面会有些限制,比如写判断式。还有一个需要注意的问题,Case函数只返回第一个符合条件的值,剩下的Case部分将会被自动忽略。...语
CASE 搜索条件1 2 3 4 5 6 7 SELECT OrderID, Quantity, CASEWHEN Quantity > 30 THEN "The quantity is greater than 30" WHEN Quantity = 30 THEN "The quantity is 30" ELSE "The quantity is under 30" END FROM OrderDetails; CASE分组条件...
例如,可以在 SELECT、UPDATE、DELETE 和 SET 等语句以及 、IN、WHERE、ORDER BY 和 HAVING 等子句中使用 CASE。 Transact-SQL 语法约定 语法 适用于 SQL Server、Azure SQL 数据库和 Azure Synapse Analytics 的语法。 syntaxsql 复制 -- Simple CASE expression: CASE input_expression WHEN when_expression THEN...
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. We can define the syntax of a nested CASE WHEN statement as shown in the following: ...
We have following syntax for a case statement in SQL with a simple expression 1 2 3 4 5 6 SELECT CASE Expression When expression1 Then Result1 When expression2 Then Result2 ... ELSE Result END Usually, we store abbreviations in a table instead of its full form. For example, in my...
测试必备的Mysql常用sql语句系列 https://www.cnblogs.com/poloyy/category/1683347.html 前言针对数据表里面的每条记录,select查询语句叫做数据查询语言...(DQL) select的语法格式 SELECT {* | } [ FROM , … [WHER...
たとえば、SELECT、UPDATE、DELETE、SET などのステートメントや、、IN、WHERE、ORDER BY、HAVING などの句で CASE を使用できます。 Transact-SQL 構文表記規則 構文 SQL Server、Azure SQL Database、Azure Synapse Analytics の構文。 syntaxsql コピー -- Simple CASE expression: CASE input_expressio...
SQL COUNT CASE WHEN We can express the syntax of the COUNT CASE WHEN statement as shown in the following: SELECT COUNT(CASE WHEN condition THEN 1 ELSE NULL END) AS alias FROM table_name; Let us break down the previous syntax into smaller sections: ...
In order to have a table to demonstrate using the CASE expression I will be using the script in Listing 1 to create a sample table namedMyOrder. If you would like to follow along with my examples and run them on your SQL Server instance you can create this table in a database of you...