Copy link quote reply member bendrucker commented feb 21 2015. The statement above sets the value of the c1 to its current value specified by the expression valuesc1 plus 1 if there is a duplicate in unique index or primary key.
Does Sql Server Offer Anything Like Mysql On Duplicate Key
On duplicate key update. Now i am trying to use the on duplicate key update feature for a specific table which is not working giving sql syntax error i check my query i found it right given below. On duplicate key update is a mariadbmysql extension to the insert statement that if it finds a duplicate unique or primary key will instead perform an update. If you specify an on duplicate key update clause and a row to be inserted would cause a duplicate value in a unique index or primary key an update of the old row occurs. Insert into t1 abc values 123 on duplicate key update cc1. Insert into stats articleid created values 12 currentdate on duplicate key update viewscount viewscount 1 if we execute such query for the first time we will have single record with our articleid 12 viewscount 1 1 is default value if not given and current date. Couldnt find anything documentation or search wise.
On duplicate key update作用先声明一点on duplicate key update为mysql特有语法这是个坑 语句的作用当insert已经存在的记录时执行update用法什么意思举个例子 useradmint表中有一条数据如下表中的主键为id现要插入一条数据id为1password为第一次插入的密码正常写法为inseon duplicate. If update fails then insert the record into table using insert query. Lets take a look at an example of using the insert on duplicate key update to understand how it works. If you specify an on duplicate key update clause and a row to be inserted would cause a duplicate value in a unique index or primary key an update of the old row occurs. First create a table named devices to store the network devices. If you know most of the time you will get the duplicate key then.
Update t1 set cc1 where a1. Update t1 set cc1 where a1. Suppose that id is the auto. However you can work around this by using lastinsertidexpr. For example if column a is declared as unique and contains the value 1 the following two statements have similar effect. Insert into t1 abc values 123 on duplicate key update cc1.
Right now you need to do this with raw queries. Mysql insert on duplicate key update example. Update the table first using update query and where clause b. Anyway to pull off an on duplicate key update for an insert statement with mysql. For updates lastinsertid is not meaningful prior to mysql 5112. Insert into recordautomationmreport productid description quantity subtotal profit values 22olper5100260 on duplicate key update set quantity quantity5.
On duplicate key do not allow us to use where clause so there are two alternative to achieve the same. On duplicate key update inserts or updates a row the lastinsertid function returns the autoincrement value. The rows affected value is reported as 1 if a row is inserted and 2 if a row is updated unless the apis clientfoundrows flag is set. For example if column a is declared as unique and contains the value 1 the following two statements have similar effect.
Gallery of On Duplicate Key Update
