列出所有表的主键 - Postgresql

这是更准确的答案：

select tc.table_schema, tc.table_name, kc.column_name 
from  
    information_schema.table_constraints tc,  
    information_schema.key_column_usage kc  
where 
    tc.constraint_type = 'PRIMARY KEY' 
    and kc.table_name = tc.table_name and kc.table_schema = tc.table_schema
    and kc.constraint_name = tc.constraint_name
order by 1, 2;

您错过了该and kc.constraint_name = tc.constraint_name部分，因此它列出了所有约束。

像这样的东西：

select tc.table_schema, tc.table_name, kc.column_name
from information_schema.table_constraints tc
  join information_schema.key_column_usage kc 
    on kc.table_name = tc.table_name and kc.table_schema = tc.table_schema and kc.constraint_name = tc.constraint_name
where tc.constraint_type = 'PRIMARY KEY'
  and kc.ordinal_position is not null
order by tc.table_schema,
         tc.table_name,
         kc.position_in_unique_constraint;

也请考虑这一点。这将生成脚本以更改所有表。

SELECT STRING_AGG(FORMAT('ALTER TABLE %s CLUSTER ON %s;', A.table_name, A.constraint_name), E'\n') AS SCRIPT
FROM
(
    SELECT      FORMAT('%s.%s', table_schema, table_name) AS table_name, constraint_name
    FROM        information_schema.table_constraints
    WHERE       UPPER(constraint_type) = 'PRIMARY KEY'
    ORDER BY    table_name 
) AS A;

我认为获取主键和外键应该这样做。kc.position_in_unique_constraint 不为空这个条件可能只获取外键。

select tc.table_schema, tc.table_name, kc.column_name,tc.constraint_type
from 
    information_schema.table_constraints tc
    JOIN information_schema.key_column_usage kc 
        on kc.table_name = tc.table_name and kc.table_schema = tc.table_schema 
                and kc.constraint_name = tc.constraint_name
where 
--kc.position_in_unique_constraint is not null
order by tc.table_schema,
         tc.table_name,
         kc.position_in_unique_constraint;