将SQL Server查询转换为Firebird的麻烦麻烦

Question

我是Firebird的新手，并且很难将此T-SQL转换为Firebird SQL。该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"

我想，从错误和实验中，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排除在数据库之外的同时？

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

使用双引号是逃避异常字符的ANSI，我在示例中都没有看到。