Oracle Union操作时表结构字段类型不一致查询语句 -ORA-01790: expression must have same datatype as corresponding exp

Oracle union操作时字段类型不一致会报如下错误

--> ORA-01790: expression must have same datatype as corresponding expression

select * from (
SELECT table_name, column_name, data_type,DATA_LENGTH,COLUMN_ID FROM USER_TAB_COLUMNS WHERE table_name =upper('bb_sjb')
UNION
SELECT table_name, column_name, data_type,DATA_LENGTH,COLUMN_ID FROM USER_TAB_COLUMNS WHERE table_name =upper('bb_yzb')
UNION
SELECT table_name, column_name, data_type,DATA_LENGTH,COLUMN_ID FROM USER_TAB_COLUMNS WHERE table_name =upper('bb_zcpgb')
UNION
SELECT table_name, column_name, data_type,DATA_LENGTH,COLUMN_ID FROM USER_TAB_COLUMNS WHERE table_name =upper('bb_hbsjb')
UNION
SELECT table_name, column_name, data_type,DATA_LENGTH,COLUMN_ID FROM USER_TAB_COLUMNS WHERE table_name =upper('bb_bbqtb')
) WHERE COLUMN_NAME IN('ZCZE','XSSR','YYSR')

 

posted @ 2022-10-04 00:15  IT情深  阅读(948)  评论(0编辑  收藏  举报