SELECT Id, Category, Name, CASE When(Category = 'Animal') Then Property1_Value ELSE NULL END AS Age, CASE When(Category = 'Book') Then Property1_Value ELSE NULL END AS Price From CateogoryDetail 大功告成。 1. 2. 3. 用例二: USE pubs GO SELECT Title, 'Price Range' = CASE WHEN ...
一:简单Case函数 case sex when '1' then '男' when '2' then '女' else '其他' end 二:Case搜索函数 case when sex = '1' then '男' when sex = '2' then '女' else '其他' end
SELECT COUNT(IF(r.channel_type=1,1,0)) AS wangzhan, COUNT(IF(r.channel_type=2,1,0)) baozhi, COUNT(IF(r.channel_type=3,1,0)) zazhi, SUM(CASE WHEN r.channel_type=1 AND r.check_status=6 THEN 1 ELSE 0 END) AS wangzhanluyong, (CASE WHEN r.channel_type=...
CASE WHEN条件表达式函数:类似JAVA中的IF ELSE语句。 格式 CASE WHEN condition THEN result [WHEN...THEN...] ELSE result END 例子: SELECT STUDENT_NAME, (CASE WHEN score<60THEN'不及格'WHEN score>=60AND score <80THEN'及格'WHEN score>=80THEN'优秀'ELSE'异常'END) AS REMARK FROM TABLE 1、查询...
selectupdate_time,create_time,case when (update_time is null or update_time = '') then create_time else update_time endfrom表名; 2、当更新时间和创建时间为判断条件且如果更新时间为空就时就根据创建时间来判断,否则用更新时间判断 select*from表名 twhere( ...
case when ... then .. when .. then ... end 这种表达式,是sql的不同条件分支结果。举例如下,1、创建数据表,create table test_student(stu_id number, class_id number);2、插入测试数据,insert into test_student values(1,1001);insert into test_student values(2,1001);insert into ...
select if,,,select case when then else end from select if(sal>3000,CONCAT(ename,'工资太高了'),CONCAT(ename,'正常')) from emp; select CASE when chengji>=90 then '优秀' when chengji between 70 and 89 then '良好' when chengji between 60 and 69 then '及格' else...
SELECT CASE WHEN THEN ELSE END AS 方法一: SELECT CASE WHEN SUBSTRING(timerange, LENGTH(timerange)) < "5" THEN CONCAT(SUBSTRING(timerange, 1, LENGTH(timerange) - 1), "0") ELSE CONCAT(SUBSTRING(timerange, 1, LENGTH(timerange) - 1), "5")...
因为你用了 else null end, 也就是出来3类 销售笔数,同期销售笔数,null,把这句删了就可以了 修改如下 select case when to_date(to_char(shdate,'yyyy-mm-dd'),'yyyy-mm-dd')= to_date(to_char(sysdate-1,'yyyy-mm-dd'),'yyyy-mm-dd') then '销售笔数'when to_date(to_char(...
,(ORACLE中使用NVL(第二字段,第一字段))这个完全可以代替你的case when了 您说的传值,怎么讲?where条件这些都是可以正常使用的 where (case when 第二字段 is not null then 第二字段 else 第一字段 end) = 值 或者where ISNULL(第二字段,第一字段) = 值 就这么正常使用就可以了 ...