我正在尝试在 oracle apex 中构建图表，但无法解析 sql 查询。提前感谢您的帮助。
SELECT NULL LINK,
E.EquipmentDescription LABEL,
sum(EC.TIMECHECKEDIN - EC.TIMECHECKEDOUT) VALUE
From EQUIPMENT_CHECKOUT EC
join EQUIPMENT E on E.EQUIPMENTID = EC.EQUIPMENTID
group by E.EQUIPMENTDESCRIPTION