left join和right join和inner join和full join；sql；plsql；MySQL；SqlServer；PostgreSQL；sqlite；Oracle
sql數據集關係理解 left join(左聯接) 返回包括左表中的所有記錄和右表中聯結字段相等的記錄 right join(右聯接) 返回包括右表中的所有記錄和左表中聯結字段相等的記錄 inner join(等值連接) 只返回兩個表中聯結字段相等的行 通俗講： left以 left join 左側的表爲主表 right 以 right join 右側表爲主表 inner join 查找的數據是左
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