The difference between Letf join, right join, inner join

Others 2022-04-27 23:05:59 views: 0

Left join 表a on a.a=b.b

Based on table a, all data in table a will be displayed , and if table b does not meet the conditions, it will be filled with null

Right join 表a on a.a=b.b

Based on table b, all data in table b will be displayed , and if table a does not meet the conditions, it will be filled with null

Inner join 表a on a.a=b.b

will display all data matching aa=bb , not based on any table

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