可以嵌套查询,例如:
t1=table(1..3 as id,1..3 as value1) t2=table(1..3 as id,1..3 as value2) t3=table(1..3 as id,1..3 as value3) lj(lj(t1,t2,`id),t3,`id)
可以嵌套查询,例如:
t1=table(1..3 as id,1..3 as value1) t2=table(1..3 as id,1..3 as value2) t3=table(1..3 as id,1..3 as value3) lj(lj(t1,t2,`id),t3,`id)