经典范例SQL（一）

Tips:  搜集整理具有参考价值SQL，未测试

目录

• 删除表中多余的重复记录，根据单个字段（peopleId）来判断，只留有rowid最小的记录 
• 查找表中多余的重复记录（多个字段） 
• 删除表中多余的重复记录（多个字段），只留有rowid最小的记录 
• 查找表中多余的重复记录（多个字段），不包含rowid最小的记录 
• 多表关联查询

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删除表中多余的重复记录，根据单个字段（peopleId）来判断，只留有rowid最小的记录 

delete from people 
where   peopleName in (select peopleName  from people group by peopleName      having count(peopleName) > 1) 
and   peopleId not in (select min(peopleId) from people group by peopleName     having count(peopleName)>1) 

 

查找表中多余的重复记录（多个字段） 

select * from vitae a 
where (a.peopleId,a.seq) in (select peopleId,seq from vitae group by peopleId,seq having count(*) > 1) 

 

删除表中多余的重复记录（多个字段），只留有rowid最小的记录 

delete from vitae a 
where (a.peopleId,a.seq) in (select peopleId,seq from vitae group by peopleId,seq having count(*) > 1) 
and rowid not in (select min(rowid) from vitae group by peopleId,seq having count(*)>1) 

 

查找表中多余的重复记录（多个字段），不包含rowid最小的记录 

select * from vitae a 
where (a.peopleId,a.seq) in (select peopleId,seq from vitae group by peopleId,seq having count(*) > 1) 
and rowid not in (select min(rowid) from vitae group by peopleId,seq having count(*)>1)   

多表关联查询

define query ad_query(@stdname string,@unitname string,@starttime date ,@endtime date)
begin
 
    select  org.stdname AS "单位名称",jbxxb.PG_JB_ZCPGXMMC AS "项目名称", data.GROUPID  AS "基于文件类型的全部下载" , index.ATTACHMENTID AS "附件ID", index.ATTACHMENTNAME AS "附件名称" , zb.title AS "附件类型" ,  '全部下载' AS  "全部下载", '下载' AS  "下载",index.uploaddate AS "附件上传时间",  index.uploadusername AS "附件上传人"
 
       from  THR_ATTACHMENT_INDEX as index

          join  RP_BLOBZBDATA as data

             on  data.recid = index.ATTACHMENTID
              
          join pg_fjb as fjb

	        ON data.GROUPID = fjb.PG_FJ_ZCPGBGS 
		OR data.GROUPID = fjb.PG_FJ_ZXHNDSJBG 
		OR data.GROUPID = fjb.PG_FJ_JJXWPFWJ 
		//......
	

            join b0101_zb as zb

               on zb.recid = data.zb_id

            join  md_org  as org

               on  fjb.unitid=org.recid   and  org.stdname CONTAINS @stdname

            join pg_jbxxb as jbxxb 

               on jbxxb.unitid=fjb.unitid and jbxxb.datatime=fjb.datatime and jbxxb.PG_JB_ZCPGXMMC CONTAINS @unitname 

            where data.INS_TIME between @starttime and @endtime
end