獲取表名及注釋：
select relname as tabname,cast(obj_description(relfilenode,'pg_class') as varchar) as comment from pg_class c
where relkind = 'r' and relname not like 'pg_%' and relname not like 'sql_%' order by relname
過濾掉分表：
加條件 and relchecks=0 即可
獲取字段名、類型、注釋、是否為空：
SELECT col_description(a.attrelid,a.attnum) as comment,format_type(a.atttypid,a.atttypmod) as type,a.attname as name, a.attnotnull as notnull
FROM pg_class as c,pg_attribute as a where c.relname = '表名' and a.attrelid = c.oid and a.attnum>0
補充：PostgreSQL查詢表主鍵及注釋內容
網上關于pgSql獲取表主鍵的內容都是千篇一律，并且對于存在多主鍵的場景不支持。
附上測試后可獲取多個主鍵字段值的SQL
SELECT
string_agg(DISTINCT t3.attname,',') AS primaryKeyColumn
,t4.tablename AS tableName
, string_agg(cast(obj_description(relfilenode,'pg_class') as varchar),'') as comment
FROM
pg_constraint t1
INNER JOIN pg_class t2 ON t1.conrelid = t2.oid
INNER JOIN pg_attribute t3 ON t3.attrelid = t2.oid AND array_position(t1.conkey,t3.attnum) is not null
INNER JOIN pg_tables t4 on t4.tablename = t2.relname
INNER JOIN pg_index t5 ON t5.indrelid = t2.oid AND t3.attnum = ANY (t5.indkey)
LEFT JOIN pg_description t6 on t6.objoid=t3.attrelid and t6.objsubid=t3.attnum
WHERE t1.contype = 'p'
AND length(t3.attname) > 0
AND t2.oid = '表名' :: regclass
group by t4.tablename
目前只找到了獲取指定表的主鍵信息，對于批量獲取沒有找到。
以上為個人經驗，希望能給大家一個參考，也希望大家多多支持腳本之家。如有錯誤或未考慮完全的地方，望不吝賜教。
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