如何使用 LIKE 通配符在列中搜索(不区分大小写)?

2021-11-20 00:00:00 sql sql-like mysql case-insensitive

我环顾四周，没有找到我想要的东西，所以这里是.

I looked around some and didn't find what I was after so here goes.

SELECT * FROM trees WHERE trees.`title` LIKE '%elm%'

这很好用，但如果树被命名为 Elm 或 ELM 等就不行了...

This works fine, but not if the tree is named Elm or ELM etc...

如何让 SQL 对这个通配符搜索不区分大小写?

How do I make SQL case insensitive for this wild-card search?

我使用的是 MySQL 5 和 Apache.

I'm using MySQL 5 and Apache.

推荐答案

SELECT * FROM trees WHERE trees.`title` COLLATE UTF8_GENERAL_CI LIKE '%elm%'

实际上，如果您将 COLLATE UTF8_GENERAL_CI 添加到您的列定义中，您可以省略所有这些技巧:它会自动工作.

Actually, if you add COLLATE UTF8_GENERAL_CI to your column's definition, you can just omit all these tricks: it will work automatically.

ALTER TABLE trees MODIFY COLUMN title VARCHAR(…) CHARACTER SET UTF8 COLLATE UTF8_GENERAL_CI.

这也将重建此列上的所有索引，以便它们可以用于查询而无需前导%"

This will also rebuild any indexes on this column so that they could be used for the queries without leading '%'

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