前言:
当前你们对“mysql条件语句”可能比较关注,我们都需要了解一些“mysql条件语句”的相关知识。那么小编也在网摘上搜集了一些有关“mysql条件语句””的相关内容,希望咱们能喜欢,看官们快快来了解一下吧!在项目开发中,我们常常会用到根据不同条件,执行不同的sql,在mysql中可以用 IF(expr1,expr2,expr3) 来满足这个需求。下面我给大家一个示例:
示例1:sql比较复杂
SELECT
if(dom.PLAN_NO is null,
(ifnull( ( SELECT sum( DELIVERY_QTY ) FROM delivery_order_materiel WHERE 1=1 and PO_NO=pom.PO_NO and MATERIEL_CODE = pom.MATERIEL_CODE ), 0 )),
ifnull( ( SELECT sum( DELIVERY_QTY ) FROM delivery_order_materiel WHERE POM_PM_CODE = pom.PM_CODE AND PLAN_NO = dpm.PLAN_NO ), 0 )
)AS tempFiled
from tableName
where 1=1
示例2:
SELECT
if(dom.PLAN_NO=1,
( SELECT sum( DELIVERY_QTY ) FROM delivery_order_materiel WHERE 1=1 and PO_NO=pom.PO_NO and MATERIEL_CODE = pom.MATERIEL_CODE ),
( SELECT sum( DELIVERY_QTY ) FROM delivery_order WHERE 1=1 AND PLAN_NO = dpm.PLAN_NO )
)AS tempFiled
from tableName
where 1=1
标签: #mysql条件语句