update la6y3_content a,la6y3_k2_items b set b.alias=a.alias where b.title=a.title
mysql列赋值列，将表1的某列的值赋给另一表的某列
update la6y3_content a,la6y3_k2_items b set b.alias=a.alias where b.title=a.title
update la6y3_content a,la6y3_k2_items b set b.alias=a.alias where b.title=a.title