在使用关系数据库(SQLServer、MySQL、Oracle、Informix)28年后，我转向了MongoDB。过去两周进展缓慢。我想提交几个问题来确认我的想法。我的文档如下所示(忽略此问题的分组):{"_id":"xyz-800","site":"xyz","user":800,"timepoints":[{"timepoint":0,"a":1500,"b":700},{"timepoint":2,"a":1000,"b":200},{"timepoint":4,"a":3500,"b":1500}],"groupings":[{"type":"MNO","group":"我想