How do I cast a string to integer and have 0 in case of error in the cast with PostgreSQL?

Question

In PostgreSQL I have a table with a varchar column. The data is supposed to be integers and I need it in integer type in a query. Some values are empty strings. The followin

Answer 1

SELECT CASE WHEN myfield="" THEN 0 ELSE myfield::integer END FROM mytable

I haven't ever worked with PostgreSQL but I checked the manual for the correct syntax of IF statements in SELECT queries.