複製表的兩種方法

1.INSERT INTO SELECT語句 
      語句形式為：Insert into Table2(field1,field2,...) select value1,value2,... from Table1

      要求目標表Table2必須存在，由於目標表Table2已經存在，所以我們除了插入源表Table1的欄位外，還可以插入常量。示例如下：

INSERT INTO SELECT語句複製表數據
   --1.創建測試表
    create TABLE Table1
    (
        a varchar(10),
        b varchar(10),
        c varchar(10),
        CONSTRAINT [PK_Table1] PRIMARY KEY CLUSTERED
        (
            a ASC
        )
    ) ON [PRIMARY]

    create TABLE Table2
    (
        a varchar(10),
        c varchar(10),
        d int,
        CONSTRAINT [PK_Table2] PRIMARY KEY CLUSTERED
        (
            a ASC
        )
    ) ON [PRIMARY]
    GO
    --2.創建測試數據
    Insert into Table1 values('趙','asds','90')
    Insert into Table1 values('錢','asds','100')
    Insert into Table1 values('孫','asds','80')
    Insert into Table1 values('李','asds',null)
    GO
    select * from Table2

    --3.INSERT INTO SELECT語句複製表數據
    Insert into Table2(a, c, d) select a,c,5 from Table1
    GO

    --4.顯示更新後的結果
    select * from Table2
    GO
    --5.刪除測試表
    drop TABLE Table1
    drop TABLE Table2

      2.SELECT INTO FROM語句

      語句形式為：SELECT vale1, value2 into Table2 from Table1

      要求目標表Table2不存在，因為在插入時會自動創建表Table2，並將Table1中指定欄位數據複製到Table2中。示例如下：

SELECT INTO FROM創建表並複製表數據
   --1.創建測試表
    create TABLE Table1
    (
        a varchar(10),
        b varchar(10),
        c varchar(10),
        CONSTRAINT [PK_Table1] PRIMARY KEY CLUSTERED
        (
            a ASC
        )
    ) ON [PRIMARY]
    GO

    --2.創建測試數據
    Insert into Table1 values('趙','asds','90')
    Insert into Table1 values('錢','asds','100')
    Insert into Table1 values('孫','asds','80')
    Insert into Table1 values('李','asds',null)
    GO

    --3.SELECT INTO FROM語句創建表Table2並複製數據
    select a,c INTO Table2 from Table1
    GO

    --4.顯示更新後的結果
    select * from Table2
    GO
    --5.刪除測試表
    drop TABLE Table1
    drop TABLE Table2