ORACLE数据库对比表结构

      ,M.TABLE_NAME

      ,M.COLUMN_ID

      ,M.COLUMN_NAME

      ,M.DATA_TYPE

      ,M.DATA_LENGTH

      ,N.OWNER

      ,N.TABLE_NAME

      ,N.COLUMN_ID

      ,N.COLUMN_NAME

      ,N.DATA_TYPE

      ,N.DATA_LENGTH

FROM

(

SELECT OWNER

      ,TABLE_NAME

      ,COLUMN_ID

      ,COLUMN_NAME

      ,DATA_TYPE

      ,DATA_LENGTH

FROM DBA_TAB_COLUMNS

WHERE OWNER=&OWNER_A

  AND TABLE_NAME=&TABLE_NAME_A

) M LEFT JOIN

(

SELECT OWNER

      ,TABLE_NAME

      ,COLUMN_ID

      ,COLUMN_NAME

      ,DATA_TYPE

      ,DATA_LENGTH

FROM DBA_TAB_COLUMNS

WHERE OWNER=&OWNER_B

  AND TABLE_NAME=&TABLE_NAME_B

) N ON  M.COLUMN_ID =N.COLUMN_ID

    AND M.COLUMN_NAME = N.COLUMN_NAME 

    AND M.DATA_TYPE = N.DATA_TYPE 

    AND M.DATA_LENGTH= N.DATA_LENGTH

ORDER BY M.TABLE_NAME, M.COLUMN_ID;

但是如果A表与B表前面的字段一致，然而B表有一些额外的字段，那么上面的SQL（左连接）就会查不出两者之间结构的不同。此时需要使用右连接才能对比出真正的表结构。所以如果需要对比两者的表结构是否一致，最好左连接查一次，右连接查一次。才能真正的确认两者的表结构的异同。

SELECT M.OWNER

      ,M.TABLE_NAME

      ,M.COLUMN_ID

      ,M.COLUMN_NAME

      ,M.DATA_TYPE

      ,M.DATA_LENGTH

      ,N.OWNER

      ,N.TABLE_NAME

      ,N.COLUMN_ID

      ,N.COLUMN_NAME

      ,N.DATA_TYPE

      ,N.DATA_LENGTH

FROM

(

SELECT OWNER

      ,TABLE_NAME

      ,COLUMN_ID

      ,COLUMN_NAME

      ,DATA_TYPE

      ,DATA_LENGTH

FROM DBA_TAB_COLUMNS

WHERE OWNER=&OWNER_A

  AND TABLE_NAME=&TABLE_NAME_A

) M RIGHT JOIN

(

SELECT OWNER

      ,TABLE_NAME

      ,COLUMN_ID

      ,COLUMN_NAME

      ,DATA_TYPE

      ,DATA_LENGTH

FROM DBA_TAB_COLUMNS

WHERE OWNER=&OWNER_B

  AND TABLE_NAME=&TABLE_NAME_B

) N ON  M.COLUMN_ID =N.COLUMN_ID

    AND M.COLUMN_NAME = N.COLUMN_NAME 

    AND M.DATA_TYPE = N.DATA_TYPE 

    AND M.DATA_LENGTH= N.DATA_LENGTH

ORDER BY M.TABLE_NAME, M.COLUMN_ID;

ORACLE数据库对比表结构

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