Question

select * from pg_tables where schemaname ='reports' and tablename like '%enhancedreports03_0%' order by tablename;

schemaname | tablename |桌主|   表空间| hasindexes | hasrules | hastriggers   ------------ + -------------------------------- + ---- ----------------- + -------------- + ------------ + ---- ------ + -------------报告| enhancedreports03_0_1970_01_01 | ss_agent_summarizer |   rpt_data_tbs | t | f | f报告|   enhancedreports03_0_2013_10_08 | ss_agent_summarizer | rpt_data_tbs |   t | f | ˚F

检查约束条件：       “enhancedreports03_0_1970_01_01_check”CHECK（0 :: double precision＆gt; = date_part（'epoch':: text，'1970-01-01':: date）AND 0 :: double precision＆lt; date_part（'epoch':: text， '1970年1月2日' ::日期））

我需要删除两个表中的约束。所以我尝试了一个动态查询来生成结果集......

select 'ALTER TABLE  '||schemaname ||'.'||tablename||' DROP CONSTRAINT '||conname||'' from pg_tables a, pg_constraint b
where schemaname ='reports' and tablename like '%enhancedreports03_0%' and conname like '%enhancedreports03_0_%' order by tablename;

？柱？

ALTER TABLE  reports.enhancedreports03_0_1970_01_01 DROP CONSTRAINT
 enhancedreports03_0_1970_01_01_check  ALTER TABLE 
 reports.enhancedreports03_0_1970_01_01 DROP CONSTRAINT
  enhancedreports03_0_2013_10_08_check  ALTER TABLE 
  reports.enhancedreports03_0_1970_01_01 DROP CONSTRAINT
  enhancedreports03_0_2013_10_08_check  ALTER TABLE 
  reports.enhancedreports03_0_1970_01_01 DROP CONSTRAINT
   enhancedreports03_0_2013_10_08_check  ALTER TABLE 
   reports.enhancedreports03_0_2013_10_08 DROP CONSTRAINT
   enhancedreports03_0_1970_01_01_check  ALTER TABLE 
    reports.enhancedreports03_0_2013_10_08 DROP CONSTRAINT
  enhancedreports03_0_2013_10_08_check  ALTER TABLE 
 reports.enhancedreports03_0_2013_10_08 DROP CONSTRAINT
   enhancedreports03_0_2013_10_08_check  ALTER TABLE 
   reports.enhancedreports03_0_2013_10_08 DROP CONSTRAINT
   enhancedreports03_0_2013_10_08_check 
(8 rows)

我需要结果集像这样

ALTER TABLE  reports.enhancedreports03_0_1970_01_01 DROP CONSTRAINT enhancedreports03_0_1970_01_01_check
ALTER TABLE  reports.enhancedreports03_0_2013_10_08 DROP CONSTRAINT enhancedreports03_0_2013_10_08_check

提前致谢阿卜杜勒

Answer 1

我已经在我的系统中检查了你的代码，它工作得非常好并且放弃你想要的，所以我最后添加了一个;希望这对你有帮助。

select 'ALTER TABLE  '||schemaname ||'.'||tablename||' DROP CONSTRAINT '||conname||';' from pg_tables a, pg_constraint b
where schemaname ='reports' and tablename like '%enhancedreports03_0%' and conname like '%enhancedreports03_0_%' order by tablename;

Answer 2

尝试查询information_schema.table_constraints，您可以直接在其中查询表格：

select 
  * 
from 
  information_schema.table_constraints 
where 
  table_name like 'enhancedreports03_0_%%' 
order by 
  table_name;

您的查询存在的问题是，由于pg_tables和pg_constraint之间缺少联接，您正在创建交叉联接。

最简单的方法是使用：

select 
    'ALTER TABLE  '||table_schema ||'.'||table_name||
    ' DROP CONSTRAINT '||constraint_name||';' 
from
    information_schema.table_constraints
where
    table_schema ='reports' 
    and table_name like '%enhancedreports03_0%' 
    and constraint_name like '%enhancedreports03_0_%' 
order by
    table_name;

Documentation

如果您想使用pg目录，则必须正确连接表：

select
  relname,
  conname
from
  pg_class pcl
  join pg_constraint pco on (pcl.oid = pco.conrelid)
where
  relname like 'enhancedreports03_0_%'

我的动态查询中的问题

？柱？

2 个答案: