联合数据库中的列

Question

我有一个字典数据库。 它有3列。

ID , word ,meaning

• 1 = landscape = meaning1
• 2 = landscape = meaning2
• 3 = landscape = meaning3
• 4 = landscape = meaning4
• 5 = landscape = meaning5
• 6 =光泽= mean1
• 7 = glossy = mean2
• 8 = glossy = mean3
• 9 = glossy = mean4

我如何结合这样的词的含义：

• 1 = landscape = meaning1，含义2，含义3，含义4，含义5
• 2 = landscape = mean1，mean2，mean3，mean4

Answer 1

您可以GROUP BY将其作为

SELECT id, word, GROUP_CONCAT(meaning ORDER BY meaning)
FROM tbl_name
GROUP BY word

对于大量值，GROUP_CONCAT将从末尾截断值。要处理此问题，请在执行查询之前设置group concat max len

SET SESSION GROUP_CONCAT_MAX_LEN=1000000

Answer 2

您正在寻找GROUP_CONCAT功能：

SELECT
    word,
    GROUP_CONCAT(meaning ORDER BY meaning)
FROM yourTable
GROUP BY
     word;

Demo