MSSQL Select 个要插入的表

Question

我正在为这段代码苦苦挣扎：

INSERT INTO Bier(Bier, BrowuerID, TypeID, GistingID, KleurID, Alcohol)
SELECT bb.Naam, b.BrouwerID, t.TypeID, g.GistingID, k.KleurID, bb.Alcoholperc
FROM BELGISCHBIER AS bb JOIN Brouwer AS b JOIN Type AS t JOIN Gisting AS g JOIN Kleur AS k

谁能告诉我为什么这行不通，因为我对 SQL

了解不多

谢谢。

Answer 1

与JOIN、SQL理解INNER JOIN。强制使用 ON 子句也是如此。

只有使用CROSS JOIN才能不写ON子句

因此，在您的 JOIN 命令中添加 ON 子句。

Answer 2

您的代码有一些语法错误，您在 Join 操作中遗漏了 On 子句

试试这样想，

INSERT INTO Bier(Bier, BrowuerID, TypeID, GistingID, KleurID, Alcohol)
SELECT bb.Naam, b.BrouwerID, t.TypeID, g.GistingID, k.KleurID, bb.Alcoholperc
FROM BELGISCHBIER AS bb <on Clause>JOIN Brouwer  AS b  <on Clause> JOIN Type on  AS t <on Clause> JOIN Gisting AS g  <on Clause>  JOIN  Kleur AS k  <on Clause>

或者你可以简单地使用 Cross Join，它不需要 On 子句。

语法：

SELECT * 
FROM table1 
CROSS JOIN table2;

示例：

INSERT INTO Bier
            (Bier,BrowuerID,TypeID,GistingID,
             KleurID,Alcohol)
SELECT bb.Naam,b.BrouwerID,t.TypeID,g.GistingID,
       k.KleurID,bb.Alcoholperc
FROM   BELGISCHBIER AS bb
       CROSS JOIN Brouwer AS b
       CROSS JOIN Type AS t
       CROSS JOIN Gisting AS g
       CROSS JOIN Kleur AS k

Answer 3

如果表之间没有公共列，请使用 Cross Join，否则如其他人所述，您需要使用 ON 条件来连接两个表

INSERT INTO Bier
            (Bier,BrowuerID,TypeID,GistingID,
             KleurID,Alcohol)
SELECT bb.Naam,b.BrouwerID,t.TypeID,g.GistingID,
       k.KleurID,bb.Alcoholperc
FROM   BELGISCHBIER AS bb
       CROSS JOIN Brouwer AS b
       CROSS JOIN Type AS t
       CROSS JOIN Gisting AS g
       CROSS JOIN Kleur AS k

Answer 4

您使用的 JOINS 没有强制性的 ON 子句，该子句决定了应该在哪些列上连接表：

INSERT INTO bier 
            ( 
                        bier, 
                        browuerid, 
                        typeid, 
                        gistingid, 
                        kleurid, 
                        alcohol 
            ) 
SELECT bb.naam, 
       b.brouwerid, 
       t.typeid, 
       g.gistingid, 
       k.kleurid, 
       bb.alcoholperc 
FROM   belgischbier AS bb 
JOIN   brouwer      AS b 
    ON bb.browuerid= b.browuerid
JOIN   type         AS t 
    ON b.BrouwerTypeID = t.BrouwerTypeID
JOIN   gisting      AS g 
    ON bb.GistingID = g.GistingID
JOIN   kleur        AS k
    ON g.KleurID = k.KleurID

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