How do I structure my query so I can count how many occurrences of a value in column 1 appears in column 2 and then store that result in a new column in the same table? (If a value is duplicated in the first column I still want to store the same value in the new column) For example if I had a table like this:How do I structure my query so I can count how
阅读背景：
MySQL计算另一列中列的值出现次数并存储在新列中
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