sql-server - 将 SQL Server 查询转换为 Firebird 时遇到问题

Question

我是 Firebird 的新手，我在将这个 T-SQL 转换为 Firebird SQL 时遇到了特别的困难。此代码存储在数据库之外，而不是存储过程中。

DECLARE @NumTotal int
DECLARE @NumUsed int

SELECT @NumTotal = COUNT(*)
    FROM "some_Table"
    WHERE "CreatedOn"=@CreatedOn

SELECT @NumUsed = COUNT(*)
    FROM "some_Table"
    WHERE "CreatedOn"=@CreatedOn AND "UserID" IS NOT NULL

SELECT @NumUsed AS "NumUsed", @NumTotal AS "NumTotal"

我猜从错误和我的实验来看，我基本上被迫以某种方式将其放入存储过程中。有没有办法在将代码保留在数据库之外的同时做到这一点？

Answer 1

您的代码可以简化为单个查询：

SELECT COUNT(*) AS numTotal,
       (SELECT COUNT(*)
          FROM YOUR_TABLE
         WHERE userid IS NOT NULL
           AND createdon = @createdon) AS numUsed
  FROM YOUR_TABLE
 WHERE createdon = @createdon

使用双引号是 ANSI 转义不寻常的字符，我在示例中没有看到。