나의 프로그래밍 공부 공간

SELECT X.TABLE_NAME TABLE_ID,
(SELECT COMMENTS FROM USER_TAB_COMMENTS WHERE TABLE_NAME = X.TABLE_NAME) TABLE_NM,
X.COLUMN_NAME FIELD_ID,
(SELECT COMMENTS FROM USER_COL_COMMENTS WHERE TABLE_NAME = X.TABLE_NAME AND COLUMN_NAME = X.COLUMN_NAME) FIELD_NAME,
X.DATA_TYPE AS "TYPE",
DECODE(X.DATA_TYPE, 'DATE', NULL, 'BLOB', NULL,
X.DATA_LENGTH || CASE WHEN X.DATA_PRECISION IS NOT NULL THEN ',' || X.DATA_SCALE END ) DATATYPES,
CASE WHEN SUBSTR(Y.INDEX_NAME, 1, 2) = 'PK' THEN 'PK'
ELSE DECODE(X.NULLABLE, 'N', 'NOT NULL', '') END "NOT NULL",
X.DATA_DEFAULT
FROM COLS X, USER_IND_COLUMNS Y
WHERE X.TABLE_NAME = Y.TABLE_NAME(+)
AND X.COLUMN_NAME = Y.COLUMN_NAME(+)
ORDER BY X.TABLE_NAME, X.COLUMN_ID