where后条件或者部分条件移到了case when后面,那么sql的计算数据集就会变大,where条件后的全部数据都要参与case when的指标计算,这就会造成不满足条件的数据也会进行计算,如果有group by的情况,可能某一个分组的指标数据都是0 3、条件表达式放在where后面,这样可以提高性能,但是同时也限制了其他维度指标的计算;条件或者...
综合起来,SQL BETWEEN CASE语句的使用示例如下: 代码语言:txt 复制 SELECT column1, column2, ... FROM table WHERE column BETWEEN value1 AND value2 AND column2 = CASE WHEN condition1 THEN result1 WHEN condition2 THEN result2 ... ELSE result END; 在这个例子中,我们可以根据column列的值是否在valu...
OR ） CASE WHEN sex = ‘1’ THEN ‘男’ WHEN sex = ‘2’ THEN ‘女’ ELSE ‘其他’ END...
可以, 但不是你那个写法 SELECT COUNT( CASE WHEN salacy BETWEEN 0 AND 1000 THEN 'a' WHEN salacy BETWEEN 1000 AND 2000 THEN 'b' WHEN salacy BETWEEN 2000 AND 3000 THEN 'c' END) AS xxxFROM gozibiaoGROUP BY salacy另外你这个SQL语句也不对, 不知道你要干嘛 select...
您可以尝试使用子查询 SELECT CASE WHEN ColName BETWEEN 0 AND 10 THEN '0-10' WHEN ColName BETWEEN 10 AND 20 THEN '10-20' WHEN ColName BETWEEN 20 AND 30 THEN '20-30' ... FROM ( SELECT <<expression>> as ColName FROM tableName ) Z Run Code Online (Sandbox Code Playgroud)归档...
当我想查询几条数据时,并且需要几条数据合并前为一条,可以使用该项(ps:我查询的是数字,没有验证其他是否有效,等想起来找一下书) select case when possibility between '10' and '30' then '10~30%' when possibility='50' then '50%' when possibility between '60' and '90' then '60~90%' when...
If you look at the code in Listing 4 you can see that the WHEN clause follows directly after the CASE clause with no text between the two clauses. This tells SQL Server this a searched CASE expression. Also note the Boolean expression following each WHEN clause. As you can see not all...
SQL Server不喜欢中间部分。谢谢 DECLARE @ReviewPeriodQuarter Int SELECT * FROM Table WHERE MONTH(Date_Received) = CASE WHEN @ReviewPeriodQuarter = 1 THEN BETWEEN 10 AND 12 WHEN @ReviewPeriodQuarter = 2 THEN BETWEEN 1 AND 3 WHEN @ReviewPeriodQuarter = 3 THEN BETWEEN 4 AND 6 WHEN @Review...
I’ve also found that this approach gives you better performance, but that might well be a quirk of SQL Server. Also, there’s no warning about NULLS being eliminated: the PIVOT function automatically assumes the elimination of NULL values when an aggregate function is used in the PIVOT ...
SQL > Advanced SQL > Case CASE is used to provide if-then-else type of logic to SQL. There are two formats: The first is a Simple CASE expression, where we compare an expression to static values. The second is a Searched CASE expression, where we compare an expression to one or ...