left join meaning in English

查询的结果左连接

Exactly opposite to left join
与左连接正好相反。
Left join or left outer join is a join that presents values for matched values and those that present only in the left table
左连接或左外连接表示匹配值和只出现在左表中的的值。
For example , you can use a left join to join a table that includes product information with a table that lists the country region in which a product was manufactured
例如，可使用left联接来联接包含产品信息的表与列出产品的制造国家/地区的表。