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  • How to insert data from one table to another in MySQL?

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    We can insert data from one table to another in MySQL. For this we use the INSERT INTO SELECT statement that selects the data from on table and inserts that data into another table.

    INSERT INTO SELECT Syntax

    We can select and insert all the columns from one table to another table:

    INSERT INTO table2
    SELECT * FROM table1;
    

    Or we can select and insert only the columns we want to insert into another table:

    INSERT INTO table2
    (column_names)
    SELECT column_names
    FROM table1;
    

    Example:

    We have two tables with the following values.

        user
    
    id  user_name     country   
    .......................................
    1   John           Canada     
    2   Chris          America        
    3   Joy            London         
    4   Jenny          Korea                              
    
        student
    
    id  student_name     country   
    .......................................
    1   Rony             Canada     
    2   Bonney           USA                
    3   Kat              Mexico 
    

    SQL INSERT INTO SELECT Examples

    Insert only a few columns from "student" into "user":

    Example

    INSERT INTO user (user_name, Country)
    SELECT student_name, country FROM student;
    

    Result

    user
    
    id  user_name     country   
    .......................................
    1   John           Canada     
    2   Chris          America        
    3   Joy            London         
    4   Jenny          Korea
    5   Rony           Canada     
    6   Bonney         USA                
    7   Kat            Mexico  
    

    Insert only the student who has country as USA into "user":

    Example

    INSERT INTO user (user_name, Country)
    SELECT student_name, country FROM student
    WHERE country='USA';
    

    Result

    user
    
    id  user_name     country   
    .......................................
    1   John           Canada     
    2   Chris          America        
    3   Joy            London         
    4   Jenny          Korea   
    5   Bonney         USA    
    

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