Oracle 查询表结构

--查询字段名称，字段类型，字段注释
SELECT DD.*, EE.CONSTRAINT_TYPE
FROM (SELECT T.COLUMN_ID,
T.COLUMN_NAME,
(CASE
WHEN (T.DATA_TYPE = 'VARCHAR2' OR T.DATA_TYPE = 'RAW') THEN
T.DATA_TYPE || '(' || T.DATA_LENGTH || ')'
WHEN (T.DATA_TYPE = 'NUMBER' AND
T.DATA_PRECISION IS NOT NULL) THEN
T.DATA_TYPE || '(' || T.DATA_PRECISION || ',' ||
T.DATA_SCALE || ')'
ELSE
T.DATA_TYPE
END) AS DATA_TYPE,
B.COMMENTS,
T.NULLABLE
FROM USER_TAB_COLUMNS T
INNER JOIN ALL_COL_COMMENTS B
ON B.COLUMN_NAME = T.COLUMN_NAME
AND T.TABLE_NAME = B.TABLE_NAME
AND T.TABLE_NAME = UPPER('T_article')) DD
LEFT JOIN

(SELECT WM_CONCAT(CC.CONSTRAINT_TYPE) AS CONSTRAINT_TYPE, CC.COLUMN_NAME
FROM (SELECT A.COLUMN_NAME, A.OWNER, A.TABLE_NAME, B.CONSTRAINT_TYPE
FROM USER_CONS_COLUMNS A, USER_CONSTRAINTS B
WHERE A.CONSTRAINT_NAME = B.CONSTRAINT_NAME --AND b.CONSTRAINT_TYPE ='P'
AND A.TABLE_NAME = UPPER('T_article')) CC
GROUP BY CC.COLUMN_NAME) EE
ON EE.COLUMN_NAME = DD.COLUMN_NAME
ORDER BY DD.COLUMN_ID;

--查询表注释
SELECT T.TABLE_NAME, T.COMMENTS, T.TABLE_TYPE FROM USER_TAB_COMMENTS T;

--查询表字段约束
(
SELECT WM_CONCAT(CC.CONSTRAINT_TYPE) AS CONSTRAINT_TYPE,
CC.COLUMN_NAME,
CC.OWNER,
CC.TABLE_NAME
FROM (SELECT A.COLUMN_NAME, A.OWNER, A.TABLE_NAME, B.CONSTRAINT_TYPE
FROM USER_CONS_COLUMNS A, USER_CONSTRAINTS B
WHERE A.CONSTRAINT_NAME = B.CONSTRAINT_NAME --AND b.CONSTRAINT_TYPE ='P'
AND A.TABLE_NAME = 'T_WEIXIN_REMIND_FUND_CHANGE') CC
GROUP BY CC.COLUMN_NAME, CC.OWNER, CC.TABLE_NAME)