分组查数据

 

 

 

SELECT licensePlate, SUM( CASE WHEN inOrOut = 'in' THEN 1 ELSE 0 END ) AS 'incount', SUM( CASE WHEN inOrOut = 'out' THEN 1 ELSE 0 END ) AS 'outcount'

FROM license_plate_traffic_record

GROUP BY licensePlate
HAVING licensePlate='赣BVM939'