How to Copy Data From One Table to Another Table in Different Database in Sql
Summary : in this tutorial, you will learn how to copy table within the same database or from one database to another using CREATE TABLE and SELECT statements.
MySQL copy table to a new table
Copying data from an existing table to a new one is very useful in some cases such as backing up data and replicating the production data for testing.
To copy data from a table to a new table, you use CREATE TABLE and SELECT statements as follows:
Code language: SQL (Structured Query Language) ( sql )
CREATE TABLE new_table SELECT col, col2, col3 FROM existing_table;
First, MySQL creates a new table with the name indicated in the CREATE TABLE statement. The structure of the new table is defined by the result set of the SELECT statement. Then, MySQL populates data that comes from the SELECT statement to the new table.
To copy partial data from an existing table to the new one, you use WHERE clause in the SELECT statement as follows:
Code language: SQL (Structured Query Language) ( sql )
CREATE TABLE new_table SELECT col1, col2, col3 FROM existing_table WHERE conditions;
It is very important to check whether the table you want to create that already exists before creating it. To do so, you use IF NOT EXIST clause in the CREATE TABLE statement. The complete command of copying data from an existing table to the new one is as follows:
Code language: SQL (Structured Query Language) ( sql )
CREATE TABLE new_table SELECT col1, col2, col3 FROM existing_table WHERE conditions;
Note that the statement above just copies the table and its data. It does not copy other database objects such as indexes, primary key constraint, foreign key constraints, triggers, etc., associated with the table.
To copy data from one table and also all the dependent objects of the table, you use the following statements:
Code language: SQL (Structured Query Language) ( sql )
CREATE TABLE IF NOT EXISTS new_table LIKE existing_table; INSERT new_table SELECT * FROM existing_table;
We need to execute two statements. The first statement creates a new table new_table by duplicating the existing_table. The second statement inserts data from the existing table into the new_table.
MySQL copy table examples
The following statement copies data from the offices table to a new table named offices_bk in the classicmodels sample database.
Code language: SQL (Structured Query Language) ( sql )
CREATE TABLE IF NOT EXISTS offices_bk SELECT * FROM offices;
We can verify the copy by querying data from the office_bk table as follows:
Code language: SQL (Structured Query Language) ( sql )
SELECT * FROM offices_bk;
In cases we want to copy the offices in the US only, we can add the WHERE clause to the SELECT statement as follows:
Code language: SQL (Structured Query Language) ( sql )
CREATE TABLE IF NOT EXISTS offices_usa SELECT * FROM offices WHERE country = 'USA'
The following statement gets all data from the offices_usa table.
Code language: SQL (Structured Query Language) ( sql )
SELECT * FROM offices_usa;
Suppose, we want to copy not only the data but also all database objects associated with the offices table, we use the following statements:
Code language: SQL (Structured Query Language) ( sql )
CREATE TABLE offices_dup LIKE offices; INSERT office_dup SELECT * FROM offices;
MySQL copy table to another database
Sometimes, you want to copy a table to a different database. In such cases you use the following statements:
Code language: SQL (Structured Query Language) ( sql )
CREATE TABLE destination_db.new_table LIKE source_db.existing_table; INSERT destination_db.new_table SELECT * FROM source_db.existing_table;
The first statement creates a new table new_table in the destination database (destination_db) by duplicating the existing table (existing_table) from the source database (source_db).
The second statements copy data from the existing table in the source database to the new table in the destination database.
Let's see the following example.
First, we create a database named testdb using the following statement:
Code language: SQL (Structured Query Language) ( sql )
CREATE DATABASE IF NOT EXISTS testdb;
Second, we create theoffices table in the testdb by copying its structure from the offices table in theclassicmodels database.
Code language: SQL (Structured Query Language) ( sql )
CREATE TABLE testdb.offices LIKE classicmodels.offices;
Third, we copy data from the classimodels.offices table to testdb.offices table.
Code language: SQL (Structured Query Language) ( sql )
INSERT testdb.offices SELECT * FROM classicmodels.offices;
Let's verify the data from the testdb.offices table.
Code language: SQL (Structured Query Language) ( sql )
SELECT * FROM testdb.offices;
In this tutorial, we have shown you various techniques to copy table within a database and from one database to another.
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How to Copy Data From One Table to Another Table in Different Database in Sql
Source: https://www.mysqltutorial.org/mysql-copy-table-data.aspx