有一個這樣的格式爲SQL或ms-access的表格。加入sql或ms-access?
樣品
ID ID2 name class example
1 10 John main
2 10
3 10
4 10 ~ is look at me.
5 20 Candice main
6 20
7 20 ~ is in Japan.
8 20 ~ is reading a book.
9 20
我需要在示例性字段(A)與具有相同的ID2爲A的名稱字段的值和class =「主」來取代「〜」。我如何製作聯合語法?
結果
ID ID2 name class example
1 10 John main
2 10
3 10
4 10 John is look at me.
5 20 Candice main
6 20
7 20 Candice is in Japan.
8 20 Candice is reading a book.
9 20
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