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

题目：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

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;

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