联接是
1. Inner Join or Equi join2. Self Join2. Outer Join outer join is again classified into a) Left Outer Join b) Right Outer Join c) Full Outer Join3. Cross join

联接是
1. Inner Join or Equi join2. Self Join2. Outer Join outer join is again classified into a) Left Outer Join b) Right Outer Join c) Full Outer Join3. Cross join