Insert values from the first table to the second table using two SELECT statements in a single MySQL query
To insert values from the first table to another table using two SELECT statements, use SUBQUERY. This will allow you to use only a single MySQL query to get the result in the second table. Let us first create a table −
mysql> create table DemoTable1
(
Name varchar(100),
Score int
);
Query OK, 0 rows affected (1.30 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable1 values('Chris',45);
Query OK, 1 row affected (0.12 sec)
mysql> insert into DemoTable1 values('Bob',78);
Query OK, 1 row affected (0.13 sec)
mysql> insert into DemoTable1 values('David',98);
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable1 values('Carol',89);
Query OK, 1 row affected (0.15 sec)Display all records from the table using select statement −
mysql> select *from DemoTable1;
This will produce the following output −
+-------+-------+
| Name | Score |
+-------+-------+
| Chris | 45 |
| Bob | 78 |
| David | 98 |
| Carol | 89 |
+-------+-------+
4 rows in set (0.00 sec)
Following is the query to create the second table.
mysql> create table DemoTable2
(
StudentName varchar(100),
StudentScore int
);
Query OK, 0 rows affected (0.58 sec)
Let us now write a MySQL query to insert values from the first table to the second table using two SELECT statements −
mysql> insert into DemoTable2(StudentName,StudentScore) values((select Name from DemoTable1 where Score=98),(select Score from DemoTable1 where Name='David'));
Query OK, 1 row affected (0.30 sec)
Display all records from the table using select statement −
mysql> select *from DemoTable2;
+-------------+--------------+
| StudentName | StudentScore |
+-------------+--------------+
| David | 98 |
+-------------+--------------+
1 row in set (0.00 sec)
Published on 24-Sep-2019 16:36:51
