MySQL(join,left join,right join,cross join)
join 用於多表中字段之間的聯繫，語法爲：... FROM table1 INNER|LEFT|RIGHT JOIN table2 ON conditiona student表：即table1 student_class表：即table2 (inner) join（內連接,或等值連接）：取得兩個表中存在連接匹配關係的記錄。 left (outer) join（左連接）：取得左表（table1）
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