选择 2 列并合并数据
我想将 col1 中的相同值与 col2 中的特定数据合并，并将其显示在 html 表中.我的sql表是这样的
I want to merge the same value in col1 and with there specific data in col2 and display it in html table. My sql table looks like this
+------+------+
|col1 |col2 |
+------+------+
|1 |test |
+------+------+
|2 |test1 |
+------+------+
|1 |test2 |
+------+------+
|1 |test4 |
+------+------+
|2 |test8 |
+------+------+
预期的结果在html表格中是这样显示的.
The expected result is displayed in html table like this.
+------+------+
| |test |
| | |
| 1 |test1 |
| | |
| |test2 |
+------+------+
| |test4 |
| 2 | |
| |test8 |
+------+------+
推荐答案
您的示例数据不明确，但您可能正在寻找 GROUP_CONCAT:
Your sample data is not explicit, but you might be looking for GROUP_CONCAT:
SELECT
col1,
GROUP_CONCAT(col2 SEPARATOR '
') col2
FROM mytable
GROUP BY col1
ORDER BY col1
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