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                # Left/Right join LEFT JOIN 關鍵字會從左表 (table_name1) 那里返回所有的行,即使在右表 (table_name2) 中沒有匹配的行. [例子](http://www.w3school.com.cn/sql/sql_join_left.asp) RIGHT JOIN 關鍵字會右表 (table_name2) 那里返回所有的行,即使在左表 (table_name1) 中沒有匹配的行. [例子](http://www.w3school.com.cn/sql/sql_join_right.asp)
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