postgres change column type string to integer
ALTER TABLE the_table ALTER COLUMN col_name TYPE integer USING (col_name::integer);
postgres change column type string to integer
ALTER TABLE the_table ALTER COLUMN col_name TYPE integer USING (col_name::integer);
postgres convert text to number
SELECT ' 5800.79 '::INTEGER;
postgresql cast
SELECT '100'::INTEGER;
SELECT CAST ('100' AS INTEGER);
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