left (outer) join:左表为主，包含左表的所有行，右表满足记录的数据列出
right (outer) join:右表为主，包含右表的所有行，左表满足记录的数据列出
cross join:笛卡尔积（所有可能的行组合）。
inner join:满足连接条件的cross组合。
full outer join:left outer 和 right outer所有行的超集。
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