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Copy column values from one table into another matching IDs in MySQL
Let us first create a table −
mysql> create table DemoTable1 ( PersonId int, Value int ); Query OK, 0 rows affected (0.64 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable1 values(100,78); Query OK, 1 row affected (0.46 sec) mysql> insert into DemoTable1 values(101,67); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable1 values(102,89); Query OK, 1 row affected (0.19 sec)
Display all records from the table using select statement −
mysql> select *from DemoTable1;
This will produce the following output −
+----------+-------+ | PersonId | Value | +----------+-------+ | 100 | 78 | | 101 | 67 | | 102 | 89 | +----------+-------+ 3 rows in set (0.00 sec)
Following is the query to create the second table.
mysql> create table DemoTable2 ( StudentId int, StudentScore int ); Query OK, 0 rows affected (0.57 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable2 values(100,NULL) ; Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable2 values(102,NULL); Query OK, 1 row affected (0.22 sec)
Display all records from the table using select statement −
mysql> select *from DemoTable2;
This will produce the following output −
+-----------+--------------+ | StudentId | StudentScore | +-----------+--------------+ | 100 | NULL | | 102 | NULL | +-----------+--------------+ 2 rows in set (0.00 sec)
Following is the query to copy column value from one table into another matching ids −
mysql> update DemoTable1, DemoTable2 set DemoTable2.StudentScore = DemoTable1.Value where DemoTable2.StudentId=DemoTable1.PersonId; Query OK, 2 rows affected (0.13 sec) Rows matched: 2 Changed: 2 Warnings: 0
Let us check the table records once again −
mysql> select *from DemoTable2;
This will produce the following output −
+-----------+--------------+ | StudentId | StudentScore | +-----------+--------------+ | 100 | 78 | | 102 | 89 | +-----------+--------------+ 2 rows in set (0.00 sec)
Updated on: 26-Sep-2019
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