Question

I want to use different queries such as update, select and etc. Is it possible to combine them in one query? And how?

Answer 1

If you need to get the “result” of an UPDATE, DELETE or INSERT query in PostgreSQL, you can use the returning clause:

DELETE FROM my_table
WHERE some_id = ...
RETURNING *;

would return all rows that were delete by that statement. Likewise with UPDATE:

UPDATE my_table 
   SET column_1 = some_value,  
       column_2 = some_other_value
WHERE some_id = ...
RETURNING *;

would return all updated rows with the new values.

I don’t think something like this is possible in MySQL though.