Postgres alter column data type8/28/2023 Now with the USING syntax, we can solve this annoying issue with this command. SELECT CASE WHEN trim ($ 1 ) SIMILAR TO ' + ' THEN CAST ( trim ($ 1 ) AS integer ) ELSE NULL END To resolve this issue - lets suppose we write a simple function like this which takes a string value and if it looks like a number, it converts it to a number otherwise it just returns NULL:ĬREATE OR REPLACE FUNCTION pc_chartoint (chartoconvert character varying ) RETURNS integer AS When multiple subcommands are given, the lock acquired will be the strictest one required by any subcommand. An ACCESS EXCLUSIVE lock is acquired unless explicitly noted. Note that the lock level required may differ for each subform. There are several subforms described below. Even if the above did work, you've got some stuff in there you don't really care about - letters and so forth or an empty string. ALTER TABLE changes the definition of an existing table.There are two issuesĪLTER TABLE ma_tiger ALTER COLUMN fraddl TYPE integerĬolumn "fraddl" cannot be cast to type "pg_catalog.int4" Description ALTER TABLE changes the definition of an existing table. So now you have this field called - fraddl which is of type CHAR(10). Let us suppose you haveĪ text or varchar field that you realize later on should have been an integer and its padded on top of that because it comesįrom some stupid DBF or mainframe import. The USING syntax is particularly handy because it allows you to control how casts are done.
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