从没有数据的另一个表的结构创建表

Question

如何在SQL(MS SQL)中实现这一点

谢谢

好的:让我清楚一下,尝试实现的是使用EXCEPT子句生成动态select语句.

例如:从@table中选择col1,col2,col3,除了从@table中选择col1,col2,col2

所以我的结果集总是基于@table而不同

进一步下来我想在CTE中使用这个@table

with filteredData as(从temptable中选择col1,col2 - (在上面创建))

下面是目前为止的代码:

    DECLARE @TABLENAME VARCHAR(200) = 'SERVICE_DELIVERY_LOCATION';
DECLARE @COLCOUNT INT ;
DECLARE @TEMPCOLNAME VARCHAR(500) ;
DECLARE @SELECTCOLUMNS VARCHAR(5000)='';
DECLARE @EXCEPTSTATEMENT VARCHAR(5000)='' ;

---------------------------------------------------------------------------------------------------
--CASE: GET COMMON_COLUMNS COLUMNS OF SOURCE AND DESTINATION TABLE
---------------------------------------------------------------------------------------------------
DECLARE @COMMON_COLUMNS TABLE( COLUMN_NAME VARCHAR(500))
INSERT  INTO @COMMON_COLUMNS 
    SELECT  SOURCE.COLUMN_NAME FROM   SCD_SOURCE.INFORMATION_SCHEMA.COLUMNS SOURCE
    INNER JOIN SCD_DESTI.INFORMATION_SCHEMA.COLUMNS DESTI ON SOURCE.COLUMN_NAME = DESTI.COLUMN_NAME


---------------------------------------------------------------------------------------------------
--CASE: GET PK COLUMNS OF SOURCE TO MAP TO DESTINATION IN CASE WHERE NEED TO DO UPDATES
---------------------------------------------------------------------------------------------------
DECLARE @PK_COLUMNS TABLE ( PK_COLUMN VARCHAR(500))
INSERT INTO @PK_COLUMNS
    SELECT KCU.COLUMN_NAME
    FROM    SCD_SOURCE.INFORMATION_SCHEMA.TABLE_CONSTRAINTS AS TC  
    JOIN    SCD_SOURCE.INFORMATION_SCHEMA.KEY_COLUMN_USAGE AS KCU ON KCU.CONSTRAINT_SCHEMA = TC.CONSTRAINT_SCHEMA  
        AND KCU.CONSTRAINT_NAME = TC.CONSTRAINT_NAME  
        AND KCU.TABLE_SCHEMA = TC.TABLE_SCHEMA  
        AND KCU.TABLE_NAME = TC.TABLE_NAME 
        AND KCU.COLUMN_NAME !=  'CREATE_DATA_CONTAINER_ID'
    WHERE TC.CONSTRAINT_TYPE IN ('PRIMARY KEY') 


SELECT  @COLCOUNT = COUNT(*) FROM @COMMON_COLUMNS

WHILE ( @COLCOUNT != 0 )
    BEGIN
        SET @TEMPCOLNAME = (SELECT TOP 1 COLUMN_NAME FROM @COMMON_COLUMNS)
        SET @SELECTCOLUMNS = @SELECTCOLUMNS + @TEMPCOLNAME + ', '
        DELETE FROM @COMMON_COLUMNS WHERE COLUMN_NAME = @TEMPCOLNAME
        SELECT  @COLCOUNT = COUNT(*) FROM @COMMON_COLUMNS
    END

SET @SELECTCOLUMNS = SUBSTRING(@SELECTCOLUMNS, 1, LEN(@SELECTCOLUMNS) - 1)

SET @EXCEPTSTATEMENT = 'SELECT ' + @SELECTCOLUMNS + ' FROM SCD_SOURCE.DBO.' + @TABLENAME + ' EXCEPT SELECT ' + @SELECTCOLUMNS + ' FROM SCD_DESTI.DBO.' + @TABLENAME
EXEC(@EXCEPTSTATEMENT)

希望最后一行的结果集成为temptable

谢谢

Answer 1

SELECT TOP 0 *
INTO NewTable
FROM OriginalTable

这将复制结构,但不会复制约束等.如果你想要一切,最好的办法就是从SSMS生成脚本并更改表/约束/索引名称.

编辑: Re:"希望最后一行的结果集进入temptable"

您可以将最后两行更改为:

SET @EXCEPTSTATEMENT = 'SELECT * INTO MyNewTable FROM (SELECT ' + @SELECTCOLUMNS + ' FROM SCD_SOURCE.DBO.' + @TABLENAME + ' EXCEPT SELECT ' + @SELECTCOLUMNS + ' FROM SCD_DESTI.DBO.' + @TABLENAME + ') x'
EXECUTE(@EXCEPTSTATEMENT)

这会将结果集放入"真实"表中; 换句话说,你必须使用全局临时表(只需将"MyTable"更改为"## MyTable").它不适用于本地临时表("#MyTable"),因为它的范围将在EXECUTE语句中,即在EXECUTE之后,您不能拥有随后查询本地临时表的代码,因为它不会存在于该范围内.因此,它需要是一个真实的表,或一个全局临时表(可以在当前范围之外访问)/

Answer 2

我以前用过这个答案/脚本。