[英]Combine two queries in PostgreSQL
我需要在两个查询的单个数组中帮助联合:
在一个查询相关的缺席成绩的学生在一个季度:
$sSqlAsistencia =
" SELECT
ca.idcadete,
coalesce(sum(i.cantidad),0) as cantidad
FROM
cadetes ca,
cursos c,
cursos_cadetes cc
left join inasistencias i on i.fk_idcurso = cc.fk_idcurso and i.fk_idcadete = cc.fk_idcadete
WHERE
c.habilitado = true
and ca.habilitado = true
and c.fk_idanolectivo = ".$aAnoLectivoBuscar."
and c.fk_idano = ".$aAnoBuscar."
and c.fk_iddivision = ".$aDivisionBuscar."
and cc.fk_idcurso = c.idcurso
and cc.fk_idcadete = ca.idcadete
and (EXTRACT(MONTH FROM i.fecha) in ".$trimestre ." or i.cantidad is null)
GROUP BY
ca.idcadete
";
$sSqlInasistencia = $oDB->Query($sSqlAsistencia);
idcadete | cantidad
203 | 4
305 | 0
120 | 10
然后我得到的一段代码是学生/学员奖,用于满足其他问题:
$sSql = " SELECT idcadete, nombre, apellido, matricula
FROM cadetes
WHERE idcadete in
(" . $sSqlPromedioEnCadaMateria . " INTERSECT " . $sSqlPromedioConducta;
if (strlen($aPromedioGeneralEdFisicaMayorABuscar)) {
$sSql .= " INTERSECT " . $sSqlPromedioEnEdFisica;
}
$sSql .= ")";
$rsCadetesConPremio=$oDB->query($sSql);
idcadete | nombre | apellido | matricula
203 | adrian | perez | 212121
尝试将这两次咨询与INNER JOIN联系起来但是我错了,因为它应该设法将这两个查询组合在一起:
$premio = " SELECT a.idcadete, a.nombre, a.apellido, a.matricula, b.cantidad
FROM ".$rsCadetesConPremio."a inner join ".$sSqlInasistencia."b on a.idcadete = b.idcadete
ORDER BY a.idcadete";
- - 错误 - - - -
我需要以下结果:$ premio
idcadete | nombre | apellido | matricula| cantidad
203 | adrian | perez | 212121 | 4
是的,您应该能够通过将两者的结果包装为派生表来加入任意两个任意查询。 但是,您需要将两个派生表括在括号中: FROM ( ...) a INNER JOIN ( ...) b
即:
"SELECT a.idcadete, a.nombre, a.apellido, a.matricula, b.cantidad
FROM (".$rsCadetesConPremio.") a inner join (".$sSqlInasistencia.") b on a.idcadete = b.idcadete
ORDER BY a.idcadete"
这是一个简化的小提琴 。
$sSqlAsistencia = " SELECT ca.idcadete, ca.nombre, ca.apellido, ca.matricula coalesce(sum(i.cantidad),0) as cantidad FROM cadetes ca, cursos c, cursos_cadetes cc left join inasistencias i on i.fk_idcurso = cc.fk_idcurso and i.fk_idcadete = cc.fk_idcadete WHERE c.habilitado = true and ca.habilitado = true and c.fk_idanolectivo = ".$aAnoLectivoBuscar." and c.fk_idano = ".$aAnoBuscar." and c.fk_iddivision = ".$aDivisionBuscar." and cc.fk_idcurso = c.idcurso and cc.fk_idcadete = ca.idcadete and (EXTRACT(MONTH FROM i.fecha) in ".$trimestre ." or i.cantidad is null) and ca.idcadete in (" . $sSqlPromedioEnCadaMateria . " INTERSECT " . $sSqlPromedioConducta; if (strlen($aPromedioGeneralEdFisicaMayorABuscar)) { $sSqlAsistencia .= " INTERSECT " . $sSqlPromedioEnEdFisica; } $sSqlAsistencia .= ") GROUP BY ca.idcadete ";
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