Sql server 转换WHERE子句中的多个“旧格式”联接

我在SQL Server中有以下代码结构。它在WHERE子句中使用多个旧格式*=联接

SELECT ....
FROM (select ...) L1,
     (select ...) L2,
     (select ...) SE,
     (select ...) EX,
     (select ...) SE,
     (select ...) Y1,
     (select ...) Y2,
     (select ...) Y3,
     (select ...) Y4,
     (select ...) Y5
WHERE SE.FV = EX.FV
    and SE.FV *= Y1.FV
    and SE.FV *= Y2.FV
    and SE.FV *= Y3.FV
    and SE.FV *= Y4.FV
    and SE.FV *= Y5.FV
    and SE.L1 *= L1.FV
    and SE.L2 *= L2.FV
GROUP BY L1.FV, L1.Descr, L2.FV, L2.Descr
ORDER BY L1.FV, L1.Descr, L2.FV, L2.Descr

在实际代码中，selects是动态生成sql的混合体的母亲。但本质上，结构如我上面所示

上面模板的结构应该是什么，以便它使用正确的左外连接语法，而不改变查询的逻辑

也许你喜欢这个工作

SELECT L1.FV, L1.Descr, L2.FV, L2.Descr, Y1.B, Y1.A, Y2.B, Y2.A, ...
FROM (select ...) SE
     LEFT OUTER JOIN (select ...) Y1 ON SE.FV = Y1.FV
        AND LEFT OUTER JOIN (select ...) Y2 ON SE.FV = Y2.FV
        AND LEFT OUTER JOIN (select ...) Y3 ON SE.FV = Y3.FV
        AND LEFT OUTER JOIN (select ...) Y4 ON SE.FV = Y4.FV
        AND LEFT OUTER JOIN (select ...) Y5 ON SE.FV = Y5.FV
        AND LEFT OUTER JOIN (select ...) L1 ON SE.L1 = L1.FV
        AND LEFT OUTER JOIN (select ...) L2 ON SE.L2 = L2.FV,
     (select ...) EX
WHERE SE.FV = EX.FV
GROUP BY L1.FV, L1.Descr, L2.FV, L2.Descr
ORDER BY L1.FV, L1.Descr, L2.FV, L2.Descr

---

我希望，您的查询可以带到下面的结构

SELECT      L1.FV, 
            L1.Descr, 
            L2.FV, 
            L2.Descr,
            .. 
FROM                (select ...) L1
JOIN/LEFT JOIN      (select ...) L2 ON L2.Col = ....
JOIN/LEFT JOIN      (select ...) SE ON SE.Col = ....
JOIN/LEFT JOIN      (select ...) EX ON EX.Col = ....
JOIN/LEFT JOIN      (select ...) SE ON SE.Col = ....
JOIN/LEFT JOIN      (select ...) Y1 ON Y1.Col = ....
JOIN/LEFT JOIN      (select ...) Y2 ON Y2.Col = ....
JOIN/LEFT JOIN      (select ...) Y3 ON Y3.Col = ....
JOIN/LEFT JOIN      (select ...) Y4 ON Y4.Col = ....
JOIN/LEFT JOIN      (select ...) Y5 ON Y5.Col = ....
GROUP BY L1.FV, L1.Descr, L2.FV, L2.Descr
ORDER BY L1.FV, L1.Descr, L2.FV, L2.Descr;

---

您可能希望通过使用如下CTE将动态生成的sql从结构中分离出来：

WITH 
    SE AS (select 1 AS X, 2 AS FV, 3 AS L1, 4 AS L2),
    EX AS (select 1 AS X, 2 AS FV),
    Y1 AS (select 1 AS X, 2 AS FV),
    Y2 AS (select 1 AS X, 2 AS FV),
    Y3 AS (select 1 AS X, 2 AS FV),
    Y4 AS (select 1 AS X, 2 AS FV),
    Y5 AS (select 1 AS X, 2 AS FV),
    L1 AS (select 1 AS X, 3 AS FV, 'y' AS Descr),
    L2 AS (select 1 AS X, 4 AS FV, 'z' AS Descr)
SELECT L1.FV, L1.Descr, L2.FV, L2.Descr
FROM 
     SE
     INNER JOIN EX ON EX.FV = SE.FV
     LEFT JOIN Y1 ON Y1.FV = SE.FV
     LEFT JOIN Y2 ON Y2.FV = SE.FV
     LEFT JOIN Y3 ON Y3.FV = SE.FV
     LEFT JOIN Y4 ON Y4.FV = SE.FV
     LEFT JOIN Y5 ON Y5.FV = SE.FV
     LEFT JOIN L1 ON L1.FV = SE.L1
     LEFT JOIN L2 ON L2.FV = SE.L2
GROUP BY L1.FV, L1.Descr, L2.FV, L2.Descr
ORDER BY L1.FV, L1.Descr, L2.FV, L2.Descr

---

相关：您已经指定了GROUP BY列L1.FV、L1.Descr、L2.FV、L2.Descr。编写SELECT时，GRROUP BY中以外的任何其他列都应与函数一起应用。例：MAXY1.B。除此之外，您的查询应该可以工作。不同联接之间的AND语法不正确。每个连接都是一个独立于其他连接的子句；您提供的AND将在语法上附加到ON表达式的末尾，从而产生语法错误。我不理解您为什么希望分隔EX表，将其放在WHERE子句而不是内部JOIN子句中。它会起作用，但我不认为有必要。谢谢你的提示。这相当多的代码更改+200行，但是您的解决方案看起来非常优雅。所以我要试一试。我更像是一名分析师而不是开发人员，所以我的SQL非常生疏！！：