PgSql数据库函数

1.存多个用户id在一个字段，怎么获取到名称呢？

SELECT t.id,t.member,string_agg(u.name, ',' ORDER BY u.id) AS memberName FROM sys_userinfo_prevent t

LEFT JOIN sys_userinfo u ON t.member ~ ('(^|,)' || u.id || '(,|$)')

GROUP BY t.id,t.member

2.