【单选题】已知“借阅”表中有“借阅编号”、“学号”和“借阅图书编号”等字段,每个学生每借阅一本书生成一记录,要求按学生学号统计每个学生的借阅次数,下列SQL语句中正确的是( )
A.
SELECT 学号,COUNT(学号)FROM 借阅
B.
SELECT 学号,COUNT(学号)FROM 借阅 GROUP BY 学号
C.
SELECT 学号,SUM(学号)FROM 借阅
D.
SELECT 学号,SUM(学号)FROM 借阅 GROUP BY 学号
【单选题】已知"借阅"表中有"借阅编号"、"学号"和"借阅图书编号"等字段,每名学生每借阅一本书生成一条记录,要求按学生学号统计出每名学生的借阅次数,下列 SQL 语句中,正确的是
A.
SELECT 学号, COUNT( 学号 ) FROM 借阅
B.
SELECT 学号, COUNT( 学号 ) FROM 借阅 GROUP BY 学号
C.
SELECT 学号, SUM( 学号 ) FROM 借阅
D.
SELECT 学号, SUM( 学号 ) FROM 借阅 ORDER BY 学号
【简答题】用条分法分析黏性土坡的稳定性时,需假定几个可能的滑动面,这些滑动面均是最危险的滑动面。
【简答题】粘性土坡的稳定分析的瑞典条分法是假定土坡沿着______滑动的稳定性计算方法。
【单选题】The total of a single-column sales journal is posted at the end of the month
A.
as a debit to the Accounts Receivable account and a credit to the Sales account.
B.
to the Sales account, Cash account, and Accounts Receivable account.
C.
to the Sales account only.
D.
as a debit to the Sales account and a credit to the Accounts Receivable account.
【简答题】Total absoption cost of sales
【判断题】数码显示器件有共阴极的;也有共阳极的,相应的发光段均为高电平时才发光