Monthly Archives: July 2012

mongoDB query: is not null and compare two field values

Posted on July 23, 2012 by Xiaomeng (Shawn) Wan

db.user.find({campaign:{$exists:true},’order.discount’:{$ne:null},$where:function() {return this.order.discount.code != this.campaign.offer.coupon} })

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awk commands

Posted on July 4, 2012 by Xiaomeng (Shawn) Wan

awk -F’\t’ ‘BEGIN{initialization}{for every line}END{postprocessing}’ inputfile

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