Oracle用SQL语句实现desc函数功能

Oracle用SQL语句实现desc函数功能： SELECT A.COLUMN_NAME 字段名, DATA_TYPE ||DECODE(DATA_TYPE,

Oracle用SQL语句实现desc函数功能

[日期：2012-05-18] 来源：Linux社区 作者：Linux [字体：]

Oracle用SQL语句实现desc函数功能：

SELECT A.COLUMN_NAME 字段名,
DATA_TYPE ||DECODE(DATA_TYPE,'DATE','','CLOB','','BLOB','','BFILE','','FLOAT','','LONG RAW','','LONG','','RAW','(' || TO_CHAR(DATA_LENGTH) || ')',
(DECODE(SIGN(INSTR(DATA_TYPE, 'CHAR')),1,
'(' || TO_CHAR(DATA_LENGTH) || ')',(DECODE(SUBSTR(DATA_TYPE, 1, 9),
'TIMESTAMP', '',
(DECODE(NVL(DATA_PRECISION, -1), -1,
'',(DECODE(NVL(DATA_SCALE, 0), 0,
'(' || TO_CHAR(DATA_PRECISION) || ')', '(' || TO_CHAR(DATA_PRECISION) || ',' ||
TO_CHAR(DATA_SCALE) || ')'))))))))) 字段类型,
A.NULLABLE 允许为空,
A.DATA_DEFAULT 默认值,
B.COMMENTS 字段注释
FROM ALL_TAB_COLUMNS A,
ALL_COL_COMMENTS B
WHERE B.TABLE_NAME=A.TABLE_NAME
AND A.OWNER=B.OWNER
AND A.COLUMN_NAME=B.COLUMN_NAME
AND A.TABLE_NAME =UPPER( 'TABLE_NAME')
AND A.OWNER =UPPER( 'USER')
ORDER BY COLUMN_ID;

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