postgresql 获取表注释

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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