Question

我几乎已经用Sql Server替换了我们的应用程序后端，但我遇到了一个问题。以下Access查询不适用于Sql Server。

SELECT table1.*
FROM   table1
       INNER JOIN (table2
                   INNER JOIN table3
                           ON ( table2.custkey = table3.custkey )
                              AND ( table2.sequence = table3.sequence ))
               ON table1.account = table2.account
WHERE  (( LEFT(table2.keyid, 1) = 'B' ))
ORDER  BY table3.lastname & table3.firstname,
          table1.account;

我已经尝试过此声明的多种变体，但无法使其发挥作用。对此声明的一些帮助将帮助我修改其他一些。任何帮助将不胜感激。

Answer 1

唯一突出的是“&”，它在SQL Server中是+。但是，访问中的&也将NULL值视为空字符串，需要在SQL Server中使用ISNULL进一步处理：

SELECT table1.*
FROM   table1
       INNER JOIN (table2
                   INNER JOIN table3
                           ON ( table2.custkey = table3.custkey )
                              AND ( table2.sequence = table3.sequence ))
               ON table1.account = table2.account
WHERE  (( LEFT(table2.keyid, 1) = 'B' ))
ORDER  BY isnull(table3.lastname,'') + isnull(table3.firstname,''),
          table1.account;

如果我是从头开始在SQL Server中编写查询，我可能会连续进行连接，而不是在加入t1之前在括号中执行t2-t3。第一个字符的测试也将表示为LIKE（个人偏好）。

  SELECT table1.*
    FROM table1
    JOIN table2 ON table1.account = table2.account
    JOIN table3 ON table2.custkey = table3.custkey AND table2.sequence = table3.sequence
   WHERE table2.keyid LIKE 'B%'
ORDER BY isnull(table3.lastname,'') + isnull(table3.firstname,''), table1.account;

Answer 2

SELECT table1.*
FROM   table1
INNER JOIN table2  ON table1.account = table2.account
INNER JOIN table3  ON ( table2.custkey = table3.custkey ) 
                      AND ( table2.sequence = table3.sequence )
WHERE  LEFT(table2.keyid, 1) = 'B' 
ORDER  BY table3.lastname, table3.firstname, table1.account;

如果您希望where子句适合索引，请使用LIKE重写：

SELECT table1.*
FROM   table1
INNER JOIN table2  ON table1.account = table2.account
INNER JOIN table3  ON ( table2.custkey = table3.custkey ) 
                      AND ( table2.sequence = table3.sequence )
WHERE  table2.keyid LIKE 'B%' 
ORDER  BY table3.lastname, table3.firstname, table1.account;

如何使此Access sql语句与Sql Server一起使用？

2 个答案: