已知用户表user中存在字段count,现要查询count字段值为null的用户,下面SQL 语句中正确的是( ) 选项: A:SELECT * FROM user WHERE count = null B:SELECT * FROM user WHERE count link null C:SELECT * FROM user WHERE count='null' D:SELECT * FROM user WHERE count is null 语句 存在 查询 发布时间:2024-07-17 18:32:35