Question

我有一个问题如何组合sql语句（内部联接和联合所有。作为SQL中的新手。希望所有成员都可以帮助我解决问题。附带SQL。leave_Trx和leave_History包含相同的值需要结合。谢谢。

select m.name, t.startdt, t.enddt,t.noday,t.createdDT,
      (case when t.approveST = 'Y' then 'Approved' when t.approveST = 'N' then 'Not Approved' else 'Pending' end) as appST
      from leave_Trx t
      inner join leave_MType m on m.typeID = t.trxID
      inner join hr_personaldata b on b.pers_ID = @pers_ID
      where year(t.startdt) = @yyear
      and b.pers_ID = @pers_ID and b.pers_name LIKE '%'+@pers_name+'%'
      and b.pers_compID LIKE ''+@compID+''
      union all
      select * from leave_History h
      where year(h.startdt) = @yyear and h.status = 'A'
      ORDER BY t.startdt

Answer 1

 select  t.pers_ID,t.startdt, t.enddt,t.noday,t.createdDT,
      (case when t.approveST = 'Y' then 'Approved' when t.approveST = 'N' then 'Not Approved' else 'Pending' end) as appST
      from leave_Trx t
      inner join leave_MType m on m.typeID = t.pers_ID
      inner join hr_personaldata l on l.pers_ID = @pers_ID
      where year(t.startdt) = @yyear and t.status = 'A'
      union all
      select h.pers_ID, h.startdt, h.enddt,h.noday,h.createdDT,
      (case when h.approveST = 'Y' then 'Approved' when h.approveST = 'N' then 'Not Approved' else 'Pending' end) as appST 
      from leave_History h
      inner join leave_MType m on m.typeID = h.pers_ID
      inner join hr_personaldata b on b.pers_ID = @pers_ID
      where year(h.startdt) = @yyear and h.status = 'A'

将Union ALL与Inner Join语句结合使用

1 个答案: