SELECT CASE WHEN 1 > 0 AND 2 > 0 THEN 1 WHEN 0 < 1 AND 0 < 2 THEN 1 ELSE 0 END AS multiple_WHEN, CASE WHEN (1 > 0 AND 2 > 0) OR (0 < 1 AND 0 < 2) THEN 1 ELSE 0 END AS single_OR Would the remainder of the WHEN conditions need to be evalu...
1 MySQL CASE to SET an extra field value in one query 6 Mysql CASE statement multiple columns 3 mysql case satisfies more than one condition 0 case when mysql with multiple conditions 25 MYSQL CASE STATEMENT MULTIPLE CONDITIONS 0 MySQL column with conditional value 0 Using CASE for mu...
SELECT a.*,DATE_FORMAT(a.createTime,'%Y-%m-%d') createTime, b.pName, case type when 1 then '指挥部会议' when 1 then '指挥部办公室会议' else '指挥部现场协调会' end type FROM meetingInfo a LEFT JOIN projBasic b ON a.pCode = b.pCode WHERE a.id =66 -- 删除 accountInfo 的唯...
在日常项目中,mysql的case when then end还是比较有意思的,请看例子: select的使用 数据表结构: 执行语句: SELECT count(*), CASE WHEN role_count between1and100THEN'一般'WHEN role_count between101and1000THEN'不错'WHEN role_count between1001and5000THEN'很棒'WHEN role_count>=5001THEN'非常棒'ELSE'...
select p.product_id, p.type_id, p.product_name, p.type, case p.type_id when 10 then (CONCAT_WS(' ' , first_name, middle_name, last_name )) else (null) end artistC from Product p inner join Product_Type pt on pt.type_id = p.type_id left join Product_ArtistAuthor paa on ...
可以。例如:user表中有id,name,sex三个字段 select case when (select count(id) from user where sex='男')>10 then '男人有10人以上'else '10人以内' end as count from user;
MySQL>SELECT IF(0.1,1,0);->0MySQL>SELECT IF(0.1<>0,1,0);->1 1. 2. 3. 4. MySQL条件select case在所示的第一个例子中,IF(0.1)的返回值为0,原因是 0.1 被转化为整数值,从而引起一个对 IF(0)的检验。这或许不是你想要的情况。在第二个例子中,比较检验了原始浮点值,目的是为了了解是否其为...
SELECT DISTINCT(Product_ID) FROM Sales; 1. COUNT函数 SQL语句中用来统计个数的函数 功能:查询满足条件的记录总数,也就是行数 SELECT COUNT(Member_ID) FROM Sales; -- 发生交易的记录数(会去掉NULL值)那么如果COUNT(Member_ID)和COUNT(*)的结果不一样,就说明Member_ID有缺失值 ...
十九、case 1.作用 是sql 用来 作为 if-then-else 之类的关键字 2.语法 (1)select 需要显示的字段名1 '可以自定义', 需要显示的字段名2 '可以自定义', (2)case when 条件1 then 结果1 when 条件2 then 结果2 (3)else end '显示结果的字段名' ...
I can select multiple rows with one condition by using something like: SELECT `Col`, `Col2` FROM `Table` WHERE `Col3` IN (?, ?, ?, ?, ?); # This selects 5 rows How can this be done if there are multiple conditions (all integer equals operations)? There are three condition...