sql 数据库两个或多个字段值拼接代码

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//之间不加空格的:concat(ES.NOTICE_ID,ES.DEPT_ID)
select PUB.BILL_ID AS COUNT,ES.DEPT_NAME from ES_NOTICE_TARGET ES JOIN PUB_FILES PUB ON PUB.BILL_ID=concat(ES.NOTICE_ID,ES.DEPT_ID) GROUP BY PUB.BILL_ID ,ES.DEPT_NAME 
//加空格或者其他的: concat(concat(ES.NOTICE_ID,''),ES.DEPT_ID)
 select PUB.BILL_ID AS COUNT,ES.DEPT_NAME from ES_NOTICE_TARGET ES JOIN PUB_FILES PUB ON PUB.BILL_ID=concat(concat(ES.NOTICE_ID,''),ES.DEPT_ID) GROUP BY PUB.BILL_ID ,ES.DEPT_NAME