Insert in a table based on result of a select from another table

Question

I have 2 Tables Named Shop and Location

• table Shop has a column name

• table Location has a column description

For every line of table shop, I want to insert a line in table Location that respect the following structure:

Location.description = Shop.name + "-Location"

So for every Shop, I want to insert a location with

description=Shop.name.concat("-Location")

Please how can I write one sql query to solve this problem.

Answer 1

You use insert . . . select insert . . . select insert . . . select . Presumably, you want something like this:

INSERT INTO location(description)
    SELECT DISTINCT CONCAT(s.name, '-Location')
    FORM shops s;

You can also use || for string concatenation in many databases:

INSERT INTO location(description)
    SELECT DISTINCT s.name || '-Location'
    FORM shops s;