In the image above, I calculate an average price for products sold in the US. I wasn’t careful with the ELSE in the CASE WHEN. In the first example, I use 0 for all products that are not from the US, which lowers the overall average price. If there would be many non-US products...
一般用法1select (case when 1=2 or 'a' like '%b%' then 'a' when 1=4 or 'b' in ('b','bb') then 'b' else 'c' end)as testField from dual 结果为b。多次when和java中else if一样 执行顺序是从前到后 当满足某个when后则后面的when不再执行... ...
8.4, 9.0脚本名：randomcase.py作用：随机大小写Example: Input: INSERT Output: InsERt Tested ...
关于两种case when(转) 转载:case when用法 一、case when的使用方法 Case具有两种格式。简单Case函数和Case搜索函数。 第一种 格式 : 简单Case函数 : 格式说明 case 列名 when 条件值1 then 选项1 when 条件值2 then 选项2… else 默认值 end eg: select case job_level when &lsqu... ...
CASE WHEN email LIKE '%@example.com' THEN REPLACE(email, '@example.com', '@newexample.com') ELSE email END AS updated_email FROM users; 1. 2. 3. 4. 5. 6. 7. 这个查询会查找所有以@example.com结尾的邮箱地址,并将其替换为@newexample.com。
ExampleGet your own SQL Server SELECTOrderID, Quantity, CASE WHENQuantity >30THEN'The quantity is greater than 30' WHENQuantity =30THEN'The quantity is 30' ELSE'The quantity is under 30' ENDASQuantityText FROMOrderDetails; Try it Yourself » ...
Example 2-50 Simple CASE Expression 代码语言:javascript 代码运行次数:0 运行 AI代码解释 DECLAREgradeCHAR(1):='B';appraisalVARCHAR2(20);BEGINappraisal:=CASEgradeWHEN'A'THEN'Excellent'WHEN'B'THEN'Very Good'WHEN'C'THEN'Good'WHEN'D'THEN'Fair'WHEN'F'THEN'Poor'ELSE'No such grade'END;DBMS_OUTPU...
WHEN country='C' or country='D' THEN '2组' WHEN country='E' or country='F' THEN '3组' END ps. Order by 后也可使用Case when 用于筛选需要的排序数据 Example: order by case when ISNULL(A.ReqDate,'')!='' then A.ReqDate else A.PlanReqDate end desc...
ELSE PRINT 'EXISTS evaluated to false' This is an example of EXISTS with a query that returns 0 rows. It is a perfectly valid query that produces an empty result set. For the first time, we see the FALSE output. IF EXISTS(SELECT * FROM sys.databases WHERE database_id = -1) ...
SELECTcustomer_id, first_name,CASEWHENcondition1THENresult1WHENcondition2THENresult2-- Add more WHEN conditions and results as neededELSEelse_resultENDASalias_nameFROMtable_name; TheELSEclause has no condition as it is executed if none of theWHENconditions are matched. For example, ...