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[英]MySQL: Select distinct values from one column if other column has two determined values in junction table
[英]How to select distinct values from one column from on table and entire other table?
SELECT (DISTINCT visits.user_id), purchases FROM visits
试图这样做,但它不起作用。
使用聚合。 也许:
SELECT v.user_id, ANY_VALUE(purchases)
FROM visits v
GROUP BY v.user_id;
或者,如果您想要购买总数——假设purchases
是一个数字:
SELECT v.user_id, SUM(purchases)
FROM visits v
GROUP BY v.user_id;
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