直接運行SQL查詢的輸出

Question

我有一組查詢，在不同的表中添加4個不同的列，名稱有些類似。因此，我通過在一組動態sql中調用INFORMATION_SCHEMA.COLUMNS來創建所有4個查詢的聯合，這些動態sql具有所有表的名稱和所有4個列。 現在我想一次執行所有這些查詢，而不是逐個執行每個查詢。那麼我該如何實現呢？

這是我作出的查詢：這是給我的輸出作爲

SELECT * FROM (SELECT 
'IF NOT EXISTS(SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME =''' + TABLE_NAME + ''' AND COLUMN_NAME = ''FromDays'') ALTER TABLE '+ TABLE_NAME +' ADD FromDays varchar(50) NULL; ' AS qry 
FROM INFORMATION_SCHEMA.TABLES 
WHERE TABLE_NAME LIKE '%tbl_PPT_Query_Order%' 
UNION ALL 
SELECT 
'IF NOT EXISTS(SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME =''' + TABLE_NAME + ''' AND COLUMN_NAME = ''ToDays'') ALTER TABLE '+ TABLE_NAME +' ADD ToDays varchar(50) NULL; ' AS qry 
FROM INFORMATION_SCHEMA.TABLES 
WHERE TABLE_NAME LIKE '%tbl_PPT_Query_Order%' 
UNION ALL 
SELECT 
'IF NOT EXISTS(SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME =''' + TABLE_NAME + ''' AND COLUMN_NAME = ''FromDays_Top'') ALTER TABLE '+ TABLE_NAME +' ADD FromDays_Top varchar(50) NULL; ' AS qry 
FROM INFORMATION_SCHEMA.TABLES 
WHERE TABLE_NAME LIKE '%tbl_PPT_Query_Order%' 
UNION ALL 
SELECT 
'IF NOT EXISTS(SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME =''' + TABLE_NAME + ''' AND COLUMN_NAME = ''ToDays_Top'') ALTER TABLE '+ TABLE_NAME +' ADD ToDays_Top varchar(50) NULL; ' AS qry 
FROM INFORMATION_SCHEMA.TABLES 
WHERE TABLE_NAME LIKE '%tbl_PPT_Query_Order%') x 

：

Answer 1

DECLARE @SQL NVARCHAR(MAX); 
SELECT @SQL = (
    (
     SELECT 
     'IF NOT EXISTS(SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME =''' + TABLE_NAME + ''' AND COLUMN_NAME = ''MyColumn1'') ALTER TABLE '+ TABLE_NAME +' ADD MyColumn1 varchar(50) NULL; ' AS qry 
     FROM INFORMATION_SCHEMA.TABLES 
     WHERE TABLE_NAME LIKE '%myTable%' 
    ) 
    + CHAR(13) + 
    (
     SELECT 
     'IF NOT EXISTS(SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME =''' + TABLE_NAME + ''' AND COLUMN_NAME = ''MyColumn2'') ALTER TABLE '+ TABLE_NAME +' ADD MyColumn2 varchar(50) NULL; ' AS qry 
     FROM INFORMATION_SCHEMA.TABLES 
     WHERE TABLE_NAME LIKE '%myTable%' 
    ) 
    + CHAR(13) + 
    (
     SELECT 
     'IF NOT EXISTS(SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME =''' + TABLE_NAME + ''' AND COLUMN_NAME = ''MyColumn3'') ALTER TABLE '+ TABLE_NAME +' ADD MyColumn3 varchar(50) NULL; ' AS qry 
     FROM INFORMATION_SCHEMA.TABLES 
     WHERE TABLE_NAME LIKE '%myTable%' 
    ) 
) 
; 
SELECT @SQL 
--EXECUTE SP_ExecuteSQL @SQL 
; 

如果結果是根據自己的喜好，刪除SELECT @SQL在底部，取消註釋EXECUTE SP_ExecuteSQL @SQL以執行這些命令。

首先編輯：

好吧，我爲有此誤解了這個問題的背景下道歉。這樣的事情如何：

DECLARE @SQL NVARCHAR(MAX); 
SELECT @SQL = REPLACE(SUBSTRING(
    (
    SELECT CHAR(10) 
    + 'IF NOT EXISTS(SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME =''' 
    + TABLE_NAME 
    + ''' AND COLUMN_NAME = ''FromDays'') ALTER TABLE ' 
    + TABLE_NAME 
    +' ADD FromDays varchar(50) NULL; ' 
    FROM INFORMATION_SCHEMA.Tables 
    WHERE TABLE_NAME LIKE '%tbl_PPT_Query_Order%' 
    ORDER BY TABLE_NAME 
    FOR XML PATH('') 
    ) 
,1,4000),'#x0D',CHAR(10)) 
    + 
    REPLACE(SUBSTRING(
     (
     SELECT CHAR(10) 
     + 'IF NOT EXISTS(SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME =''' 
     + TABLE_NAME 
     + ''' AND COLUMN_NAME = ''ToDays'') ALTER TABLE ' 
     + TABLE_NAME 
     +' ADD ToDays varchar(50) NULL; ' 
     FROM INFORMATION_SCHEMA.Tables 
     WHERE TABLE_NAME LIKE '%tbl_PPT_Query_Order%' 
     ORDER BY TABLE_NAME 
     FOR XML PATH('') 
     ) 
    ,1,4000),'#x0D',CHAR(10)) 
    + 
    REPLACE(SUBSTRING(
     (
     SELECT CHAR(10) 
     + 'IF NOT EXISTS(SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME =''' 
     + TABLE_NAME 
     + ''' AND COLUMN_NAME = ''FromDays_Top'') ALTER TABLE ' 
     + TABLE_NAME 
     +' ADD FromDays_Top varchar(50) NULL; ' 
     FROM INFORMATION_SCHEMA.Tables 
     WHERE TABLE_NAME LIKE '%tbl_PPT_Query_Order%' 
     ORDER BY TABLE_NAME 
     FOR XML PATH('') 
     ) 
    ,1,4000),'#x0D',CHAR(10)) 
    + 
     REPLACE(SUBSTRING(
     (
     SELECT CHAR(10) 
     + 'IF NOT EXISTS(SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME =''' 
     + TABLE_NAME 
     + ''' AND COLUMN_NAME = ''ToDays_Top'') ALTER TABLE ' 
     + TABLE_NAME 
     +' ADD ToDays_Top varchar(50) NULL; ' 
     FROM INFORMATION_SCHEMA.Tables 
     WHERE TABLE_NAME LIKE '%tbl_PPT_Query_Order%' 
     ORDER BY TABLE_NAME 
     FOR XML PATH('') 
     ) 
    ,1,4000),'#x0D',CHAR(10)) 
SELECT @SQL 
--EXECUTE SP_ExecuteSQL @SQL 
;