将用户访问查询从 postgreSQL 转换为 SQL Server

Question

我正在努力将 PostgreSQL 查询转换为 SQL 服务器，并试图了解下面的查询到底在做什么。我了解这些连接，但其余部分根本不清楚。谁能帮帮我。

select c.name 
 FROM CNT c
 LEFT JOIN shares s ON
 c.id = s.id AND s.username::name = "current_user"()
  WHERE c.username::name = "current_user"() OR 'admin'::text = (( SELECT user_role_privs.granted_role
          FROM user_role_privs
          WHERE user_role_privs.granted_role = 'admin'::text)) OR s.username IS NOT NULL AND s.grantee_username::text <> ''::text

Answer 1

我相信下面的查询是 SQL Server 等效的。我添加了 dbo 模式名称和语句终止符来说明最佳实践，但这在技术上不是必需的。

SELECT  c.name
FROM    dbo.CNT AS c
        LEFT JOIN dbo.shares s ON c.id = s.id
                              AND s.username = CURRENT_USER
WHERE   c.username = CURRENT_USER
        OR IS_MEMBER(N'admin') = 1
        OR s.username IS NOT NULL
        AND s.grantee_username <> '';