选择也是MySQL中的关键字的列 [英] Selecting a column that is also a keyword in MySQL

问题描述

由于某种原因，我正在工作的一家新公司的开发人员决定将其列命名为忽略"和存在".现在，当我在where子句中使用这些单词运行MySQL查询时，会出现语法错误.但是，我似乎无法弄清楚如何在不出错的情况下引用这些列.我尝试将它们设置为字符串，但这没有任何意义.

For some reason, the developers at a new company I'm working for decided to name their columns "ignore" and "exists". Now when I run MySQL queries with those words in the where clause, I get a syntax error; however, I can't seem to figure out how to reference those columns without running into an error. I tried setting them as strings, but that doesn't make any sense.

帮助?

还有，这种不匹配的术语吗?

Also, is there a term for this kind of mismatch?

推荐答案

将名称放在反引号中:

`ignore`, `exists`

如果您要处理多个表或数据库，则需要分别转义数据库名称，表名称和字段名称(如果每个都与关键字匹配):

If you're working across multiple tables or databases you need to escape the database name, table name, and field name separately (if each matches a keyword):

SELECT * FROM `db1`.`table1`
LEFT JOIN `db2`.`table2` on `db1`.`table1`.`field1`=`db2`.`table2`.`field2`

只有与关键字实际匹配的部分才需要转义，因此诸如:

Only the portions that actually match a keyword have to be escaped, so things like:

select * from `db1`.table

还可以.

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