如何解决案例转换为Char Oracle SQL的编号
我在正确使用大小写/转换将数字转换为CHAR时遇到问题。我一直在研究堆栈溢出，并不断看到不同的技术，但是似乎没有一种对我有用。我确定我缺少一些简单的东西，但这对我来说将是一次很好的学习经历。
SELECT c.Client_ID,c.Last_Name,c.First_Name,d.Sched_Time,d.Time_In,d.Time_Out,(Round(d.Sched_Duration/15,1)) AS Units,(d.Time_Out - d.Time_In) * 60 * 24 AS Mins,CASE
WHEN d.Eventstatus = 1 THEN CAST('Completed' AS char(20))
WHEN d.Eventstatus = 10 THEN CAST('Cancelled: No Show' AS char(20))
WHEN d.Eventstatus = 11 THEN CAST('Cancelled: Early Dismissal' AS char(20))
WHEN d.Eventstatus = 12 THEN CAST('Cancelled: Office Closed' AS char(20))
WHEN d.Eventstatus = 13 THEN CAST('Deleted - Error' AS char(20))
WHEN d.Eventstatus = 14 THEN CAST('Cancelled: Provider Absent' AS char(20))
WHEN d.Eventstatus = 15 THEN CAST('Cancelled: Waiver' AS char(20))
WHEN d.Eventstatus = 2 THEN CAST('Cancelled: Client Cancelled' AS char(20))
WHEN d.Eventstatus = 3 THEN CAST('Pending Completion' AS char(20))
WHEN d.Eventstatus = 4 THEN CAST('Cancelled: Absent' AS char(20))
WHEN d.Eventstatus = 5 THEN CAST('Cancelled: Out Of Medication' AS char(20))
WHEN d.Eventstatus = 6 THEN CAST('Cancelled: Other' AS char(20))
WHEN d.Eventstatus = 7 THEN CAST('Cancelled: Field Trip' AS char(20))
WHEN d.Eventstatus = 8 THEN CAST('Cancelled: Refused Treatment' AS char(20))
ELSE d.Eventstatus
END AS Appt_Status,CASE
WHEN d.Activity_Desc = '<b>OASAS</b> <i>(Group)</i>' THEN 'OASAS -Group'
WHEN d.Activity_Desc = '<b>OASAS</b> <i>(Individual)</i>' THEN 'OASAS - Individual'
ELSE d.Activity_Desc
END AS Visit_Reason,CASE
WHEN d.ProvidersID = 113706 THEN CAST('Name One' AS char(20))
WHEN d.ProvidersID = 117917 THEN CAST('Name Two' AS char(20))
WHEN d.ProvidersID = 117919 THEN CAST('Name Three' AS char(20))
WHEN d.ProvidersID = 117920 THEN CAST('Name Four' AS char(20))
WHEN d.ProvidersID = 117921 THEN CAST('Name Five' AS char(20))
WHEN d.ProvidersID = 117922 THEN CAST('Name Six' AS char(20))
ELSE d.ProvidersID
END AS Provider,d.SRVID,d.dlsequence
FROM Clients c
INNER JOIN DAILY_LOG_DATA d
ON c.SHISID = d.SHISID
WHERE d.SRVID IN (37913,36186,36185,36180,36179,36168,36167,36182,36181,36173,36172,36177,36176,36175,36174,36178,36184,36183,36188,36187)
AND d.Sched_Time >= TO_DATE('2020-09-7 01:00:00','YYYY/MM/DD HH:MI:SS')
AND d.Sched_Time < TO_DATE('2020-09-16 12:59:00','YYYY/MM/DD HH:MI:SS')
解决方法
不要将文字字符串转换为char()；它们已经是字符串了，因此innot不能解决实际的问题，即case表达式的所有分支都必须返回相同数据类型的值。而是将数字转换为else的{{1}}分支中的字符串。
case在Oracle中，您也可以使用CASE
WHEN d.Eventstatus = 1 THEN 'Completed'
WHEN d.Eventstatus = 10 THEN 'Cancelled: No Show'
-- more "WHEN" branches here
WHEN d.Eventstatus = 8 THEN 'Cancelled: Refused Treatment'
ELSE TO_CHAR(d.Eventstatus)
END AS Appt_Status,：
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