left join和right join和inner join和full join；sql；plsql；MySQL；SqlServer；PostgreSQL；sqlite；Oracle
sql数据集关系理解 left join(左联接) 返回包括左表中的所有记录和右表中联结字段相等的记录 right join(右联接) 返回包括右表中的所有记录和左表中联结字段相等的记录 inner join(等值连接) 只返回两个表中联结字段相等的行 通俗讲： left以 left join 左侧的表为主表 right 以 right join 右侧表为主表 inner join 查找的数据是左
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