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                [mysql基礎及優化](http://www.hmoore.net/book/a173512/mysql/edit) 插入查詢更新等操作條件是null時不能用=(=表示null字符串),需要用is null條件 ``` select id from `shop_goods` where `brand_id` is NULL; update `shop_goods` set `brand_id`='1' where `brand_id` is NULL; ```
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