Postgres function assign query results to multiple variables

Question

I need to assign values to 2 variable as below in Postgres function.

a := select col1 from tbl where ...
b := select col2 from tbl where ...

How can I assign 2 values to 2 variables in one line command?

Like

a,b := select col1,col2 from tbl where ...

Answer 1

As said in "40.5.3. Executing a Query with a Single-row Result" (emphasis mine):

The result of a SQL command yielding a single row (possibly of multiple columns) can be assigned to a record variable, row-type variable, or list of scalar variables. This is done by writing the base SQL command and adding an INTO clause.

So this should work:

SELECT col1, col2 INTO a, b FROM tbl WHERE...;