如何使用union all获得两列结果

uidvcgyl 于 2021-06-20 发布在 Mysql

关注(0)|答案(1)|浏览(566)

我需要在result上得到（debe和haber）列，我使用union all，但我总是只得到这两列中的一列。
我的问题是：

(SELECT tblfacturas.id                 AS ID, 
        tblclientes.razonsocial        AS Cliente, 
        tblfacturas.fecha              AS Fecha, 
        tblfacturas.tipocomprobante    AS Tipo, 
        tblfacturas.nrofacturacompleto AS Numero, 
        tblfacturas.total              AS Debe 
 FROM   tblfacturas 
        left join tblclientes 
               ON tblclientes.id = tblfacturas.id_cliente 
 WHERE  tblclientes.razonsocial = 'S.A.') 
UNION ALL 
(SELECT tblrecibos.id                AS ID, 
        tblclientes.razonsocial      AS Cliente, 
        tblrecibos.fecha             AS Fecha, 
        'R'                          AS Tipo, 
        tblrecibos.nrorecibocompleto AS Numero, 
        tblrecibos.total             AS Haber 
 FROM   tblrecibos 
        left join tblclientes 
               ON tblclientes.id = tblrecibos.id_cliente 
 WHERE  tblclientes.razonsocial = 'S.A.') 
ORDER  BY fecha

mysql union-all

来源：https://stackoverflow.com/questions/52152752/how-to-get-two-columns-result-with-union-all

1条答案

按热度按时间

xhv8bpkk1#

如果不存在列debe和haber，则需要null，否则将在相同的列（debe）中获得这两个结果

SELECT TblFacturas.id as ID
  , TblClientes.razonsocial as Cliente
  ,TblFacturas.fecha as Fecha
  ,TblFacturas.tipocomprobante as Tipo
  ,TblFacturas.nrofacturacompleto as Numero
  , TblFacturas.total as Debe 
  , null as Haber 
  FROM TblFacturas 
  left join TblClientes on TblClientes.id = TblFacturas.id_cliente 
  where TblClientes.razonsocial = 'S.A.' 
UNION ALL

  SELECT TblRecibos.id 
  , TblClientes.razonsocial 
  ,TblRecibos.fecha 
  , 'R' 
  ,TblRecibos.nrorecibocompleto 
  , null 
  , TblRecibos.total 
  FROM TblRecibos 
  left join TblClientes on TblClientes.id = TblRecibos.id_cliente 
  where TblClientes.razonsocial = 'S.A.'
  order by fecha

还有一个建议。。在where子句中，左联接中包含的列将作为不包括行的内部联接使用。如果不存在该列的左联接值，则应
或者移动on子句中的where条件（如果还需要not macthing行）

SELECT TblRecibos.id 
  , TblClientes.razonsocial 
  ,TblRecibos.fecha 
  , 'R' 
  ,TblRecibos.nrorecibocompleto 
  , null 
  , TblRecibos.total 
  FROM TblRecibos 
  left join TblClientes on TblClientes.id = TblRecibos.id_cliente 
    AND  TblClientes.razonsocial = 'S.A.'

如果只需要匹配的行，也可以使用内部联接

SELECT TblRecibos.id 
  , TblClientes.razonsocial 
  ,TblRecibos.fecha 
  , 'R' 
  ,TblRecibos.nrorecibocompleto 
  , null 
  , TblRecibos.total 
  FROM TblRecibos 
  INNER join TblClientes on TblClientes.id = TblRecibos.id_cliente 
    AND  TblClientes.razonsocial = 'S.A.'

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如何使用union all获得两列结果

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