程序猿的《MySQL语法练习》成绩 - 打字成绩 - 在线打字练习（dazi.91xjr.com）

select dname from dept select dname,lower(dname) from dept select dname,lower(dname),upper(dname) from dept select dname,length(dname),loc,length(loc) from dept SELECT dname,SUBSTR(dname,2) from dept...