一组有用的 Oracle SQL Script

-- get Oracle Currnet User Table/View Schema
SELECT
M.TABLE_TYPE TTYPE, T.TABLE_NAME TNAME, M.COMMENTS TDESC
, T.COLUMN_NAME CNAME, C.COMMENTS CDESC, T.DATA_TYPE DTYPE
, T.DATA_LENGTH DLENGTH, T.DATA_PRECISION DPRECISION, T.DATA_SCALE DSCALE
, T.NULLABLE, T.COLUMN_ID CID, T.DATA_DEFAULT DDEFAULT
, T.CHAR_COL_DECL_LENGTH
FROM USER_TAB_COLUMNS T, USER_TAB_COMMENTS M, USER_COL_COMMENTS C
WHERE T.TABLE_NAME = M.TABLE_NAME AND (T.TABLE_NAME = C.TABLE_NAME AND T.COLUMN_NAME = C.COLUMN_NAME)
ORDER BY T.TABLE_NAME, T.COLUMN_ID;

--get Database Language Parameters
SELECT * FROM NLS_DATABASE_PARAMETERS;

--判断指定日期是当月的第几周（当月第一天所在的周定义为第一周）
SELECT
DECODE(SIGN(A.WEEK_OF_MONTH), 1, A.WEEK_OF_MONTH, A.WEEK_OF_MONTH + 52)
FROM (
SELECT TO_CHAR(TO_DATE('&DATE', 'MM/DD/YYYY') + 1, 'IW') - TO_CHAR(TRUNC(TO_DATE('&DATE', 'MM/DD/YYYY'), 'MM') + 1, 'IW') + 1 AS WEEK_OF_MONTH FROM DUAL
) A;