给定一些任意的SQL,我想获取返回列的数据类型。该语句可能会连接许多表, View ,TVF等。我知道我可以根据查询创建一个 View 并从中获取数据类型,希望有一种更快的方法。只想到我已经想到编写一个.net实用程序来运行SQL并检查结果,想知道是否有TSQL答案。



给定(不是真实表,仅是示例)

SELECT p.Name AS PersonName, p.Age, a.Account as AccountName
FROM Person as p
LEFT JOIN Account as a
    ON p.Id = a.OwnerId

我想要一些类似的东西

PersonName:(nvarchar(255),不为null)

年龄:(smallInt,不为null)

等等...

最佳答案

    /*you may have to alias some columns if they are not unique*/
    /*EDIT: added fix for 2byte nchar/nvarchar */
    SELECT top (1)  /*<your query columns here>*/
    INTO #tmp99
    /*<rest of your query here>*/


    SELECT 'CREATE TABLE [tablename]('  UNION ALL
    SELECT CASE WHEN ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) = 1 THEN '' ELSE ',' END
    + CHAR(13) + '[' + c.name + '] [' + t.name + ']'
    + CASE WHEN c.system_type_id IN (165,167,173,175)
           THEN CASE WHEN c.max_length <> -1
                     THEN '(' + CAST(c.max_length AS varchar(7)) + ')'
                     ELSE '(max)'
                     END
           WHEN c.system_type_id IN (231,239)
           THEN CASE WHEN c.max_length <> -1
                     THEN '(' + CAST(c.max_length/2 AS varchar(7)) + ')'
                     ELSE '(max)' END
           ELSE
               CASE WHEN c.system_type_id IN (41,42,43)
                    THEN '(' + CAST(c.scale AS varchar(7)) + ')'
                    ELSE
                        CASE WHEN c.system_type_id IN (106,108)
                             THEN '(' + CAST(c.precisiON AS varchar(7)) + ',' + CAST(c.scale AS varchar(7)) + ')'
                             ELSE ''
                             END
                    END
           END

    + CASE WHEN c.is_nullable = 1 THEN ' NULL' ELSE ' NOT NULL' END

    FROM tempdb.sys.columns c
    JOIN tempdb..sysobjects o ON (c.object_id = o.id)
    JOIN tempdb.sys.types t ON (t.user_type_id = c.user_type_id)
    WHERE o.name LIKE '#tmp99%'
    UNION ALL SELECT ')'
    FOR XML PATH('')

    DROP TABLE #tmp99

10-05 20:19
查看更多