我有一个查询,使用两个外部连接的LEFT OUTER JOIN从三个表中提取数据。我需要查询返回最左边的(Salesrep表)信息,即使在两个右边的表(分别是处方药和处方)中没有对应的数据也是如此。当我在WHERE子句中没有日期参数的情况下运行此查询时,我得到了预期的返回,但是当我包含日期参数时,在没有任何销售代表匹配数据的情况下,我什么也没有得到返回。我至少需要查看查询中请求的salesrep表列。
这是查询...非常感谢您的帮助。
SELECT salesrep.salesrepid as SalesRepID,
salesrep.fname as SalesrepFName,
salesrep.lname as SalesRepLName,
salesrep.fname+' '+salesrep.lname as SalesRepFullName,
prescriber.dea_no as PDeaNo,
prescriber.lname+', '+prescriber.fname as DocName,
CONVERT(VARCHAR(8), prescriptions.filldate, 1) as FillDate,
prescriptions.drugname as DrugName,
prescriptions.daysupply as Supply,
prescriptions.qtydisp as QtyDisp,
prescriptions.rx_no as Refill,
prescriptions.copay as Sample,
ROUND(prescriptions.AgreedToPay-(prescriptions.AgreedToPay*.07),2) as AgreedToPay,
prescriptions.carrierid as CarrierID
FROM salesrep
LEFT OUTER JOIN prescriber on salesrep.salesrepid = prescriber.salesrepid
LEFT OUTER JOIN prescriptions on prescriber.dea_no = prescriptions.dea_no
WHERE salesrep.salesrepid = 143 AND
prescriptions.filldate >= '09-01-12' AND
prescriptions.filldate <= '09-17-12'
ORDER BY prescriptions.filldate
最佳答案
您应该将对prescriptions.filldate
的约束移到联接的ON
条件中,并将其从where
子句中删除:
LEFT OUTER JOIN prescriptions ON prescriber.dea_no = prescriptions.dea_no
AND prescriptions.filldate >= '09-01-12'
AND prescriptions.filldate <= '09-17-12'
否则,没有
prescriptions
的条目将以null
中的prescriptions.filldate
结尾,并且WHERE
子句将其丢弃。