SQL 查询以查找 2000 年之前出生的人

Question

Two relationships are given: Employee (AngID, Name, Surname, Date of Birth, Gender, Education, Position, Monthly Salary, DepID) Department (DepID, DepName, City)

Print the SQL statement or statements that solve the following problem: To display the number of employees according to the year of birth, who are born until the year 2000. The following will be displayed: Year, Number. The tuples will be ordered in descending order of the year of birth.

我试过这个：

SELECT Year, Number
FROM Employee
WHERE Date of Birth <2000 AS Num
ORDER BY Date of Birth DESC

Answer 1

我假设这是您要查询的内容：

SELECT YEAR(DateofBirth) as Year, Count(1) AS NumberOfEmployees
FROM Employee
WHERE DateofBirth < '2000-01-01'
GROUP BY YEAR(DateofBirth)
ORDER BY YEAR(DateofBirth) DESC

此查询将过滤所有 2000 年之前出生的员工。它将按年份对记录进行分组并显示计数。

sqlfiddle 例子

Answer 2

To display the number of employees

COUNT(*)

FROM Employee emp

according to the year of birth

GROUP BY DATEPART(YEAR, [Date of Birth])

who are born until the year 2000.

WHERE [Date of Birth] < '2001-01-01'

The following will be displayed: Year, Number.

DATEPART(YEAR, [Date of Birth]) AS [Year], 
COUNT(*) AS [Number]

The tuples will be ordered in descending order of the year of birth.

ORDER BY [Year] DESC

SQL:

SELECT
  DATEPART(YEAR, [Date of Birth]) AS [Year] 
, COUNT(*) AS [Number] 
FROM Employee emp
WHERE [Date of Birth] < '2001-01-01' 
GROUP BY DATEPART(YEAR, [Date of Birth]) 
ORDER BY [Year] DESC

SQL 查询以查找 2000 年之前出生的人

SQL Query to find who are born until the year 2000

sql

sql-server

tuples