Insert multiple rows from another table but the inserted records should be distinct

For this, you can use DISTINCT along with the INSERT INTO SELECT statement. Let us first create a table −

mysql> create table DemoTable1
(
   Value int
);
Query OK, 0 rows affected (1.03 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable1 values(50);
Query OK, 1 row affected (0.18 sec)
mysql> insert into DemoTable1 values(10);
Query OK, 1 row affected (0.12 sec)
mysql> insert into DemoTable1 values(10);
Query OK, 1 row affected (0.10 sec)
mysql> insert into DemoTable1 values(60);
Query OK, 1 row affected (0.11 sec)
mysql> insert into DemoTable1 values(50);
Query OK, 1 row affected (0.09 sec)
mysql> insert into DemoTable1 values(70);
Query OK, 1 row affected (0.10 sec)
mysql> insert into DemoTable1 values(50);
Query OK, 1 row affected (0.14 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable1;

This will produce the following output −

+-------+
| Value |
+-------+
|    50 |
|    10 |
|    10 |
|    60 |
|    50 |
|    70 |
|    50 |
+-------+
7 rows in set (0.00 sec)

Following is the query to create the second table.

mysql> create table DemoTable2
(
   Marks int
);
Query OK, 0 rows affected (1.20 sec)

Following is the query to insert multiple rows from another table. The inserted records should be distinct −

mysql> insert into DemoTable2(Marks) select distinct Value from DemoTable1;
Query OK, 4 rows affected (0.18 sec)
Records: 4 Duplicates: 0 Warnings: 0

Display all records from the table using select statement −

mysql> select *from DemoTable2;

This will produce the following output −

+-------+
| Marks |
+-------+
|    50 |
|    10 |
|    60 |
|    70 |
+-------+
4 rows in set (0.00 sec)

AmitDiwan

Updated on: 26-Sep-2019

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