在表结构为(职工号,工资)的表Employee中查询职工号的第5位开始的4 个字符为“0426”职工情况,正确的 SQL 命令是
①
SELECT * FROM Employee WHERE STR(职工号,5,4)=0426
②
SELECT * FROM Employee WHERE SUBSTR(职工号,5,4)=0426
③
SELECT * FROM Employee WHERE STR(职工号,4,5)=0426
④
SELECT * FROM Employee WHERE SUBSTR(职工号,4,5)=0426