»Õ¡ÒÃÈÖ¡ÉÒ 2566
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select substr(gro,1,4) as g1 from student where substr(gro,1,3) = '642' group by g1 order by g1 DESC
select * from groups where code like '6420%'

ÅӴѺ	ÃËÑÊ¡ÅØèÁ	¨Ó¹Ç¹
1	6420	43