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給定一個包含表「TAB1」的數據庫「firstdb」。此表是不是學生信息罷了,可表現爲跟隨從SQL數據庫獲得統計信息HTML
ID Last Name First Name Date of Birth School Specialty Sex
01 yves marco 03/03/2000 la roccade school letter man
02 marchal zeko 05-12-1999 johara school letter man
03 ghisil maria 15-03-2000 johara school science women
04 belbali john 30-10-1999 lever school science man
05 santa sofi 04-05-2000 la roccade school science women
06 yves don 16/04/2000 la roccade school lette man
的perpos如果用這個數據來提取的統計信息,根據一些冒號:「學校,專業,性別」裏的結果應爲如下:
School Specialty Sex number
la roccade school letter man 02
la roccade school letter women 00
la roccade school science man 00
la roccade school science women 01
johara school letter man 01
johara school letter women 00
johara school science man 00
johara school science women 01
lever school letter man 00
lever school letter women 00
lever school science man 01
lever school science women 00
PS:數據量不固定。它可以改變的地方。
它的工作很好,謝謝。現在的問題是顯示這些數據。含義:僅顯示第二個表中顯示的列:_「學校,專業,性別」_。以及創建一個名爲_「numbers」_的新列來顯示統計信息。非常感謝你。 –