CompTIA
DA0-002 · Question #95
A data analyst receives a request for the current employee head count and runs the following SQL statement: SELECT COUNT(EMPLOYEE_ID) FROM JOBS The returned head count is higher than expected because
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Data Acquisition and Preparation
Question
A data analyst receives a request for the current employee head count and runs the following SQL statement:
SELECT COUNT(EMPLOYEE_ID) FROM JOBS The returned head count is higher than expected because employees can have multiple jobs. Which of the following should return an accurate employee head count?
Options
- ASELECT JOB_TYPE, COUNT DISTINCT(EMPLOYEE_ID) FROM JOBS
- BSELECT DISTINCT COUNT(EMPLOYEE_ID) FROM JOBS
- CSELECT JOB_TYPE, COUNT(DISTINCT EMPLOYEE_ID) FROM JOBS
- DSELECT COUNT(DISTINCT EMPLOYEE_ID) FROM JOBS
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Topics
#SQL#COUNT function#DISTINCT keyword#Data querying