sql算法總結

1.過濾掉pcf_timestamp爲0點到6點的記錄，夜間記錄不作分析  case when SUBSTRING(pcf_timestamp,5,1)="-" then pcf_timestamp  else FROM_UNIXTIME(CAST(pcf_timestamp/1000 AS BIGINT)) end  as pcf_timestamp,  hour(pcf_timestamp)

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