我正在使用INFORMIX数据库。基于informix中复杂select语句的输出删除外键约束?
我已经在表格中添加了forign键而没有给它一个名字,例如
ALTER TABLE myreport ADD CONSTRAINT FOREIGN KEY (rid) REFERENCES report(id), ADD CONSTRAINT FOREIGN KEY (uid) REFERENCES user(id);
我想删除一个select语句的输出的基础上,其forign主要制约因素如下:
ALTER TABLE myreport DROP CONSTRAINT (
SELECT b.constrname
FROM
systables a, sysconstraints b, sysindexes c, syscolumns d
WHERE
a.tabname = 'myreport' AND (d.colname='rid' or d.colname='uid')
AND
b.tabid = a.tabid
AND
c.idxname = b.idxname
AND
d.tabid = a.tabid
AND
(
d.colno = c.part1 or d.colno = c.part2 or d.colno = c.part3 or d.colno = c.part4 or
d.colno = c.part5 or d.colno = c.part6 or d.colno = c.part7 or d.colno = c.part8 or
d.colno = c.part9 or d.colno = c.part10 or d.colno = c.part11 or d.colno = c.part12 or
d.colno = c.part13 or d.colno = c.part14 or d.colno = c.part15 or d.colno = c.part16
)
);
会抛出一个错误
201: A syntax error has occurred.
但是,当我运行它分开它工作正常,并提供以下输出如下:
选择:
SELECT b.constrname
FROM
systables a, sysconstraints b, sysindexes c, syscolumns d
WHERE
a.tabname = 'myreport' AND (d.colname='rid' or d.colname='uid')
AND
b.tabid = a.tabid
AND
c.idxname = b.idxname
AND
d.tabid = a.tabid
AND
(
d.colno = c.part1 or d.colno = c.part2 or d.colno = c.part3 or d.colno = c.part4 or
d.colno = c.part5 or d.colno = c.part6 or d.colno = c.part7 or d.colno = c.part8 or
d.colno = c.part9 or d.colno = c.part10 or d.colno = c.part11 or d.colno = c.part12 or
d.colno = c.part13 or d.colno = c.part14 or d.colno = c.part15 or d.colno = c.part16
)
给出:
constrname r169_278
constrname r169_279
constrname r169_280
ALTER TABLE:
ALTER TABLE cuicscheduledreports DROP CONSTRAINT (r169_278, r169_279)
显示成功日志
所以我需要一组查询将做到实现我的动态方式的要求,因为这将被用来作为迁移的数据库不同的系统
那么问题是什么? –