我知道以下问题可能不是最佳做法。
我有一个具有以下结构的表，关键字列和标题列连接到混搭列中。
+------------+------------+-----------------------+ | Keyword | Title | Mashup | +------------+------------+-----------------------+ | Green | Green | Green Green | | Green | Watermelon | Green Watermelon | | Watermelon | Watermelon | Watermelon Watermelon | +------------+------------+-----------------------+
我想知道是否有一种方法可以对字符串进行“去重”。所以我的表格看起来更像下面这样:
+------------+------------+-----------------------+ | Keyword | Title | Mashup | +------------+------------+-----------------------+ | Green | Green | Green | | Green | Watermelon | Green Watermelon | | Watermelon | Watermelon | Watermelon | +------------+------------+-----------------------+
这可能吗？我似乎找不到解决办法。谢谢!
编辑:
+------------+------------+-------------+-----------------------------+ | Keyword | Title | Another | Mashup | +------------+------------+-------------+-----------------------------+ | Green | Green | Pink | Green Green Pink | | Green | Watermelon | Yellow | Green Watermelon Yellow | | Watermelon | Watermelon | Black | Watermelon Watermelon Black | +------------+------------+-------------+-----------------------------+
最佳答案
试试这个:
UPDATE tableA
SET Mashup = IF(Keyword = Title, Keyword, CONCAT(Keyword, ' ', Title));
检查这个SQL FIDDLE DEMO
输出
| KEYWORD | TITLE | MASHUP |
|------------|------------|------------------|
| Green | Green | Green |
| Green | Watermelon | Green Watermelon |
| Watermelon | Watermelon | Watermelon |
关于mysql - 删除重复的子字符串，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/27964397/