Web一、课程内容练习. (一)汇总分析. #面试题:查询课程编号为“0002”的总成绩 select 课程号,sum (成绩) 总成绩 from score where 课程号=0002. #面试题:查询选了课程的学生人数 select count (DISTINCT 学号) 学生人数 from score where 课程号 is not null. #注:去重distinct ()确保没有 ... WebSep 19, 2024 · DELETE FROM table a WHERE a.ROWID IN (SELECT ROWID FROM (SELECT ROWID, ROW_NUMBER() OVER (PARTITION BY unique_columns ORDER BY ROWID) dup …
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WebApr 14, 2024 · The first thing we need to do is load the database into DB browser: Next, we explore the data to understand what each table contains The database schema is as follows: It contains eight tables:... WebApr 21, 2006 · order by case when projectid = 3 then 1 when projectid = 1 then 2 when projectid = 2 then 3 else null end . However, by assigning 1, 2, and 3 to 3, 1, and 2, many of …
WebORDER BY 關鍵字 (SQL ORDER BY Keyword) 我們可以將 SELECT 取得的資料集依某欄位來作排序,而排序分別可以由小至大 (ascending; 預設),或由大至小 (descending)。 ORDER BY 語法 (SQL ORDER BY Syntax) SELECT table_column1, table_column2... FROM table_name ORDER BY column_name1 ASC DESC, column_name2 ASC DESC... ORDER BY 查詢用法 … WebJun 28, 2024 · Then, use GROUP BY to group total_revenue results for each movie based on the data retrieved from the movie_name column. Lastly, use ORDER BY to organize the …
WebApr 21, 2006 · order by case when projectid = 3 then 1 when projectid = 1 then 2 when projectid = 2 then 3 else null end However, by assigning 1, 2, and 3 to 3, 1, and 2, many of you might have been hopelessly confused. The point is, the values that are assigned are not actually in the row, they are like a virtual column. WebJan 1, 2002 · order by 3, 2, 1. SQL> SQL> CREATE TABLE employees 2 ( employee_id number (10) not null, 3 ...
WebAlphabetically, 1 comes before 2. Whenever you see the first method, it's not because it's desirable, but because the sorting is strictly alphabetical (and happens left-to-right, one character at a time): 1, 2, 10 makes sense to you but not to a computer that only knows alphabetic comparison.
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