Count based on condition in SQL Server

Question

Does anyone know how can I do a count in SQL Server based on condition.

Example:

How can I do a column count for records with name 'system', and total CaseID records in the table?

Customer table

UserID     CaseID     Name
1          100        alan
1          101        alan
1          102        amy
1          103        system
1          104        ken
1          105        ken
1          106        system  

The result will display like below:

UserID    TotalCaseID    TotalRecordsWithSystem
1         7              2

Answer 1

Use SUM/CASE...

SELECT
    COUNT(*),  --total
    SUM(CASE WHEN name = 'system' THEN 1 ELSE 0 END) --conditional
FROM
    myTable