translate()
全角英数字を半角英数字へ変換する
UPDATE t1 SET foo = translate(foo, '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ', '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ' );
参考
http://www.postgresql.jp/document/9.1/html/functions-string.html
UPDATE t1 SET foo = translate(foo, '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ', '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ' );
http://www.postgresql.jp/document/9.1/html/functions-string.html