有没有像IF NOT EXISTS这样的插入值的命令？

CREATE TABLE IF NOT EXISTS Orari (ID int AUTO_INCREMENT PRIMARY KEY,titolo Char(40), sala int ,giorno char(10),Ora char(10)); 

INSERT INTO Orari VALUES (null,null,1,'lunedi','16:30'), 
    (null,null,1,'lunedi','19:30'), 
    (null,null,2,'lunedi','16:30'), 
    (null,null,2,'lunedi','19:30'), 
    (null,null,1,'martedi','16:30'), 
    (null,null,1,'martedi','19:30'), 
    (null,null,2,'martedi','16:30'), 
    (null,null,2,'martedi','19:30'), 
    (null,null,1,'mercoledi','16:30'), 
    (null,null,1,'mercoledi','19:30'), 
    (null,null,2,'mercoledi','16:30'), 
    (null,null,2,'mercoledi','19:30'), 
    (null,null,1,'giovedi','16:30'), 
    (null,null,1,'giovedi','19:30'), 
    (null,null,2,'giovedi','16:30'), 
    (null,null,2,'giovedi','19:30'), 
    (null,null,1,'venerdi','16:30'), 
    (null,null,1,'venerdi','19:30'), 
    (null,null,2,'venerdi','16:30'), 
    (null,null,2,'venerdi','19:30'), 
    (null,null,1,'sabato','16:30'), 
    (null,null,1,'sabato','19:30'), 
    (null,null,2,'sabato','16:30'), 
    (null,null,2,'sabato','19:30'), 
    (null,null,1,'domenica','16:30'), 
    (null,null,1,'domenica','19:30'), 
    (null,null,2,'domenica','16:30'), 
    (null,null,2,'domenica','19:30');

我想把它放在一个函数中，每次我按下按钮时都会调用它。有没有像IF NOT EXISTS这样的插入值的命令？

IF NOT EXISTS适用于第一个查询...并且如果该表已经存在，它不会重新创建它。

但是插入值的第二个查询只是每次按下按钮时都会一直插入。

是否有像IF NOT EXISTS这样的命令用于插入值？

来源

2014-06-10 Haider Ali

尝试NOT EXISTS或EXISTS其中子句

来源

2014-06-10 18:35:14 Rakesh

有没有像IF NOT EXISTS这样的插入值的命令？

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