MySql copies data from one table to another table

1. Copy the data of the old table to the new table (assuming the two tables have the same structure) INSERT INTO new table SELECT * FROM old table

INSERT INTO tbl_user_copy SELECT * FROM tbl_user;

Data volume: 5 million, time: 138.678s (2.3 minutes);

Time to delete 5 million data: 142.89s (2.38 minutes)

2. Copy the table structure and data to the new table CREATE TABLE target table name SELECT * FROM source table name

select * into target table name from source table name (requires that the target table does not exist, because it will be automatically created when inserting) (Note: this statement is not suitable for mysql)

Statement: CREATE TABLE tbl_user_copy SELECT * FROM tbl_user

Data volume: 5 million, time: 113.266s;

3. Only copy the table structure:

CREATE TABLE new table
SELECT * FROM old table WHERE 1=2

3. Table backup with different table structure

INSERT INTO new table (field1, field2,....)
SELECT field1, field2,... FROM old table

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