select * from 表A,表B,表C where 表A.* like '"&keyword&"' or 表B.* like '"&keyword&"' or 表C.* like '"&keyword&"'
table1表中模糊搜索xx
select * from table1 where name like "xx"
模糊搜索xx开头
select * from table1 where name like "xx*"
模糊搜索xx结尾
select * from table1 where name like "*xx"