我正在为KnexJS进行包装,并且为了使错误更具描述性,我希望能够获得表的主列的名称。我看过了,但是找不到任何答案。我不擅长SQL,因此如果它是高级的,请尝试将其分解。
答案 0 :(得分:0)
要找出给定表上PK的PK名称和列名称:
SELECT t.relname AS table_name
, i.relname AS index_name
, ia.attname AS column_name
FROM pg_class t
JOIN pg_index ix
ON ix.indrelid = t.oid
AND ix.indisprimary = 't'
JOIN pg_class i
ON i.oid = ix.indexrelid
JOIN pg_attribute ia
ON ia.attrelid = t.oid
AND ia.attnum = ANY(ix.indkey)
WHERE t.relkind = 'r' -- table
AND t.relname = 'your_table_name'
请注意,对于复合PK(多列),它将在单独的行中列出它们。如果要每个表一行,只需GROUP BY t.relname, i.relname
,然后选择array_to_string(array_agg(ia.attname), ', ') as columns
。