mysql怎么给表取别名

在MySQL中，可以使用AS关键字或者直接在表名后面加空格再加别名来给表取别名。例如，可以使用以下语法来给表customers取别名c和给表orders取别名o：
SELECT c.c_id, o.o_num
FROM customers AS c
LEFT OUTER JOIN orders AS o
ON c.c_id = o.c_id;
另外，需要注意的是，一旦给表起了别名，在其他地方只能使用表的别名，而不能再使用表的原来名称。否则会报错。所以在使用别名时要确保不与数据库中其他表的名称冲突。 <span class="em">1</span><span class="em">2</span><span class="em">3</span>
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