sql - 计算不同的相同名称

Question

我有超过 100k 信息的表格。

ID        FirstName
1           Bob
2           Bob
3           Tom
4           John           
5           John
6           John
..          ....

想要计算多少名称相同的程序，例如它必须像：

FirstName      Count
Bob              2
Tom              1
John             3

请帮我写

Answer 1

这是非常基本的 SQL 示例，按列分组 + 聚合结果

select
    FirstName, count(*)
from Table1
group by FirstName

Answer 2

尝试这个

select FirstName,Count(FirstName) From TableA group by FirstName

Answer 3

尝试这个

SELECT FirstName, COUNT(*) As Count
FROM YourTable
GROUP BY FirstName
HAVING COUNT(*) > 1
ORDER BY COUNT(*) DESC

Answer 4

Create Procedure GetCount
as
BEGIN
Select FirstName,Count(*) from tablename group by FirstName 
END