SQL-创建表之前判断表是否存在

Posted 2020-11-05 Love In Winter

1.SQL脚本

/*
    SQL-创建表之前判断表是否存在
    LDH @ 2018-5-16
*/

USE TestDB
GO

-- 方法 1
IF OBJECT_ID(N\'Books\', \'U\') IS NOT NULL
BEGIN
    DROP TABLE Books;
END;

-- 方法 2
/*
IF EXISTS (SELECT * FROM sys.objects WHERE name = \'Books\')
BEGIN
    DROP TABLE Books;
END;
*/

-- 方法 3
/*
IF EXISTS (SELECT COUNT(1) FROM sys.tables WHERE name = \'Books\')
BEGIN
    DROP TABLE Books;
END;
*/

-- Create a new table.
CREATE TABLE Books (
    BookId INT NOT NULL,
    BookName CHAR(50) NOT NULL,
    Price MONEY );

-- Insert data into the table.
INSERT INTO Books(BookId,BookName,Price)VALUES(\'1001\',N\'人生若只如初见\',\'88\');
INSERT INTO Books(BookId,BookName,Price)VALUES(\'1002\',N\'SQl Server 2017\',\'88\');
INSERT INTO Books(BookId,BookName,Price)VALUES(\'1003\',N\'SQL必知必会\',\'50\');
INSERT INTO Books(BookId,BookName,Price)VALUES(\'1004\',N\'沥川往事\',\'80\');
INSERT INTO Books(BookId,BookName,Price)VALUES(\'1005\',N\'红楼梦\',\'100\');
INSERT INTO Books(BookId,BookName,Price)VALUES(\'1006\',N\'三国演义\',\'100\');
INSERT INTO Books(BookId,BookName,Price)VALUES(\'1007\',N\'西游记\',\'120\');
INSERT INTO Books(BookId,BookName,Price)VALUES(\'1008\',N\'水浒传\',\'100\');

-- Select the table you created just now.
SELECT BookId ,
       BookName ,
       Price FROM dbo.Books

2.运行结果