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Update table with duplicate ids in MySQL
Following is the syntax −
update yourTableName set yourColumnName1= yourValue where yourColumnName2=yourValue order by yourColumnName2 DESC LIMIT 1;
Let us first create a table −
mysql> create table DemoTable -> ( -> Id int, -> Name varchar(100) -> ); Query OK, 0 rows affected (0.61 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable values(1,'John'); Query OK, 1 row affected (0.41 sec) mysql> insert into DemoTable values(2,'Chris'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values(2,'Robert'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values(2,'David'); Query OK, 1 row affected (0.18 sec)
Display all records from the table using select statement −
mysql> select *from DemoTable;
Output
+------+--------+ | Id | Name | +------+--------+ | 1 | John | | 2 | Chris | | 2 | Robert | | 2 | David | +------+--------+ 4 rows in set (0.00 sec)
Following is the query to update table in SQL WHERE clause multiple fields −
mysql> update DemoTable set Name='Adam Smith' where Id=2 order by Id DESC LIMIT 1; Query OK, 1 row affected (0.28 sec) Rows matched: 1 Changed: 1 Warnings: 0
Let us check table records once again −
mysql> select *from DemoTable;
Output
+------+------------+ | Id | Name | +------+------------+ | 1 | John | | 2 | Adam Smith | | 2 | Robert | | 2 | David | +------+------------+ 4 rows in set (0.00 sec)
Updated on: 30-Jul-2019
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