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Populating a table from query results in MySQL?
To populate a table from query results, use the following syntax:
INSERT yourTableName(yourColumnName1,yourColumnName2,yourColumnName3,..........N) SELECT yourColumnName1,yourColumnName2,yourColumnName3,..........N FROM yourAnotherTableName;
To understand the above syntax, let us create a table. The first table is as follows with some records. The query to create a table is as follows:
mysql> create table PopulateTableDemo -> ( -> Id int NOT NULL AUTO_INCREMENT, -> Name varchar(20), -> Amount int, -> ArrivalDateTime datetime, -> PRIMARY KEY(Id) -> ); Query OK, 0 rows affected (0.68 sec)
Now you can insert some records in the table using insert command. The query is as follows:
mysql> create table PopulateTableDemo -> ( -> Id int NOT NULL AUTO_INCREMENT, -> Name varchar(20), -> Amount int, -> ArrivalDateTime datetime, -> PRIMARY KEY(Id) -> ); Query OK, 0 rows affected (0.68 sec)
Insert some records in the table using insert command. The query is as follows:
mysql> insert into PopulateTableDemo(Name,Amount,ArrivalDateTime) values('John',456,'2018-02-4');
Query OK, 1 row affected (0.17 sec)
mysql> insert into PopulateTableDemo(Name,Amount,ArrivalDateTime)
values('Carol',1000,'2019-10-21');
Query OK, 1 row affected (0.17 sec)
mysql> insert into PopulateTableDemo(Name,Amount,ArrivalDateTime) values('Sam',970,'2019-07-25');
Query OK, 1 row affected (0.14 sec)
mysql> insert into PopulateTableDemo(Name,Amount,ArrivalDateTime) values('Larry',1050,'2015-10-28');
Query OK, 1 row affected (0.16 sec)Display all records from the table using select statement. The query is as follows:
mysql> select *from PopulateTableDemo;
The following is the output:
+----+-------+--------+---------------------+ | Id | Name | Amount | ArrivalDateTime | +----+-------+--------+---------------------+ | 1 | John | 456 | 2018-02-04 00:00:00 | | 2 | Carol | 1000 | 2019-10-21 00:00:00 | | 3 | Sam | 970 | 2019-07-25 00:00:00 | | 4 | Larry | 1050 | 2015-10-28 00:00:00 | +----+-------+--------+---------------------+ 4 rows in set (0.00 sec)
Now you can create a second table and populate the value from the above table. The query to create the second table is as follows:
mysql> create table PopulateQueryFromAnotherTable -> ( -> Id int NOT NULL AUTO_INCREMENT, -> UserName varchar(20), -> Salary int, -> DepartureDateTime datetime, -> PRIMARY KEY(Id) -> ); Query OK, 0 rows affected (1.30 sec)
Here is the query to populate values from the first table which is PopulateTableDemo to PopulateQueryFromAnotherTable:
mysql> insert PopulateQueryFromAnotherTable(UserName,Salary,DepartureDateTime) -> select Name,Amount,ArrivalDateTime from PopulateTableDemo; Query OK, 4 rows affected (0.15 sec) Records: 4 Duplicates: 0 Warnings: 0
Now check the second table records using select statement. The query is as follows:
mysql> select *from PopulateQueryFromAnotherTable;
The following is the output:
+----+----------+--------+---------------------+ | Id | UserName | Salary | DepartureDateTime | +----+----------+--------+---------------------+ | 1 | John | 456 | 2018-02-04 00:00:00 | | 2 | Carol | 1000 | 2019-10-21 00:00:00 | | 3 | Sam | 970 | 2019-07-25 00:00:00 | | 4 | Larry | 1050 | 2015-10-28 00:00:00 | +----+----------+--------+---------------------+ 4 rows in set (0.00 sec)
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