是不是 约等于将选中的多列按照字符串拼接后去重. 不太理解 distinct 多列背后的逻辑
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参考文档
› http://mysql-python.sourceforge.net/MySQLdb.html
This topic created in 1629 days ago, the information mentioned may be changed or developed.
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1
Tsukihime Dec 30, 2021  1
In most cases, a DISTINCT clause can be considered as a special case of GROUP BY.
https://dev.mysql.com/doc/refman/8.0/en/distinct-optimization.html |
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2
breadenglish Dec 30, 2021 1
是
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