Update a table using the fields of the other two table, please help me in this

Question

My requirement is to update the description field in table 1 with the description of the table 2 and 3 by concatinating. I\'ll give you the structure below.

table1 -

Answer 1

INSERT INTO Table1 (Description)
    SELECT CONCAT(t2.Description, t3.Description) FROM Table2 t2, Table3 t3
    ---- optional join here