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What is the difference between MySQL inner connection, left connection and right connection?
2022-02-04 16:48:02 【Alibaba cloud Q & A】
mysql The inner connection of 、 Left connection 、 What's the difference between right connections ？
Take the answer 1：
Inner join Internal connection , When a join query is made between two tables , Keep only the exact matching result sets in both tables
left join When a join query is made between two tables , All the rows in the left table are returned , Even if there is no matching record in the right table .
right join When a join query is made between two tables , All rows of the right table are returned , Even if there is no matching record in the left table .
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