OR ） CASE WHEN sex = ‘1’ THEN ‘男’ WHEN sex = ‘2’ THEN ‘女’ ELSE ‘其他’ END...
导致虽然mio_log表的mio_date、plnmio_date字段,以及freph_a01_fromtask3表的in_force_date字段上均有索引,但是由于两表不同字段进行CASE WHEN比较,执行计划为聚集索引扫描:优化思路:由于mio_log表的mio_date、plnmio_date字段,以及freph_a01_fromtask3表的in_force_date字段上均有索引,可先通过单个mio_date、...
DB2、SQL Server 等数据库里是会报错的，在MYSQL和PostgreSQL中是能顺利执行的。
'VARCHAR' is not a recognized built-in function name. 'WHEN MATCHED' cannot appear more than once in a 'UPDATE' clause of a MERGE statement. "EXECUTE AT" with Dynamic Linked Server Name "explicit value must be specified for identity column in table" error in SQL 2000 "FROM clause have ...
case when in sql server's stored procedure Evaluates a list of conditions and returns one of multiple possible result expressions. The CASE expression hastwo formats: The simple CASE expression compares an expression to a set of simple expressions to determine the result....
2) Case:a) If the value of the <search condition> of some <searched when clause> in a <...
case when in sql server's stored procedure https://docs.microsoft.com/en-us/sql/t-sql/language-elements/case-transact-sql Evaluates a list of conditions and returns one of multiple possible result expressions. The CASE expression hastwo formats:...
SQL CASE WHEN语句性能优化,背景:性能应该是功能的一个重要参考,特别是在大数据的背景之下!写SQL语句时如果仅考虑业务逻辑,而不去考虑语句效率问题,有可能导致严重的效率问题,导致功能不可用或者资源消耗过大。其中的一种情况是,处理每日增量数据的程序,实际执行过
2回答 在SQL Server中的Where case 、、、 这就是我想要的,但我不能准确地写出代码。declare @Isprice bit=0 from [Product] p where case when @Isprice = 0 then p.ProductPrice 浏览35提问于2020-04-11得票数 1 回答已采纳 4回答 Sql Server WHERE IN with CASE 、、 我们如何在WHERE子句中指定...
If noinput_expression=when_expressionevaluates to TRUE, the SQL Server Database Engine returns theelse_result_expressionif an ELSE clause is specified, or a NULL value if no ELSE clause is specified. Searched CASE expression: Evaluates, in the order specified,Boolean_expressionfor each WHEN clause...