mysql - 如何改进/简化具有大量子查询的查询？

Question

我有一个 sql 查询，它对我的​​数据库中的一些寄存器进行求和和计数，问题是我使用了很多子查询并且它们都具有相同的条件，我需要找到一个更好的解决方案，因为这会导致我的系统运行缓慢。

我尝试使用简单的左连接，但 mysql 返回了一行，我希望它对表 dbgeneralesImportacion 上的每个寄存器进行计数和求和。

我有这样的东西:

SELECT  dbgeneralesImportacion.id,
        sapito.dbgeneralesImportacion.documentosCompletos AS 'documentosCompletos', 
        (SELECT COUNT(c.id) 
        FROM sapito.dbcontenedores c 
        WHERE c.operacion = dbgeneralesImportacion.id ) AS 'ContadorContenedores', 
        (SELECT SUM(IF(c.estatus = 1, 1, 0)) 
        FROM sapito.dbcontenedores c 
        WHERE c.operacion = dbgeneralesImportacion.id ) AS 'ContadorDespachos', 
        (SELECT SUM(IF(c.estatus = 2, 1, 0)) 
        FROM sapito.dbcontenedores c 
        WHERE c.operacion = dbgeneralesImportacion.id ) AS 'ContadorCompletado', 
        (SELECT SUM(IF(c.desconsolidacion = 1, 1, 0)) 
        FROM sapito.dbcontenedores c 
        WHERE c.operacion = dbgeneralesImportacion.id ) AS 'DesconsolidacionPuerto',
        (SELECT SUM(c.bultos) FROM sapito.dbcontenedores c WHERE c.operacion = dbgeneralesImportacion.id)  AS 'bultos'
FROM    dbgeneralesImportacion

And my idea was to do this but counts all register and return a single row:

SELECT  dbgeneralesImportacion.id AS 'id',
        COUNT(c.id) AS 'ContadorContenedores', 
        SUM(IF(c.estatus = 1, 1, 0))  AS 'ContadorDespachos', 
        SUM(IF(c.estatus = 2, 1, 0))  AS 'ContadorCompletado', 
        SUM(IF(c.desconsolidacion = 1, 1, 0))  AS 'DesconsolidacionPuerto',
        SUM(c.bultos)  AS 'bultos'
FROM    dbgeneralesImportacion
        LEFT JOIN dbcontenedores c ON c.operacion = dbgeneralesImportacion.id

Thank you everyone

Answer 1

你可以使用 join a 和 group by

     SELECT  a.id
         , a.documentosCompletos
         , COUNT(c.id) ContadorContenedores
         , SUM(IF(c.estatus = 1, 1, 0)) ContadorDespachos
         , SUM(IF(c.estatus = 2, 1, 0)) ContadorCompletado
         , SUM(IF(c.desconsolidacion = 1, 1, 0)) DesconsolidacionPuerto
         ,  SUM(c.bultos) bultos

     FROM    dbgeneralesImportacion a
     INNER JOIN sapito.dbcontenedores c ON c.operacion = a.id
     GRUP BY a.id, a.documentosCompletos