/*如表中不包含任何主柱或標識列，因此不能決定哪些值是以前的值。這將是隨機的。

上面設置的值很小，這就是爲什麼下面的查詢不會有任何問題。

如果是較大的，然後繼續前進，把標識列和

更換標識列行號列的查詢*/

SELECT

CASE

WHEN myValues1.colName IS NULL AND myValues2.colName IS NOT NULL THEN myValues2.colName

/**Selecting the previous NOT NULL value for a NULL value*/

WHEN myValues1.colName='' AND myValues2.colName IS NOT NULL THEN myValues2.colName

/**Selecting the previous NOT NULL value for an empty value*/

WHEN myValues1.colName='' AND myValues2.colName IS NULL THEN (SELECT TOP 1 colName FROM (SELECT colname,

row_number() OVER (ORDER BY (SELECT 0)) AS rowNumber

FROM myValues) myValues3 WHERE myValues3.rowNumber < myValues2.rowNumber

AND myValues3.rowNumber IS NOT NULL

AND myValues3.rowNumber<>'' ORDER BY myValues3.rowNumber DESC)

/**Selecting the prior NOT NULL value for an empty value*/

WHEN myValues1.colName IS NULL AND myValues2.colName='' THEN (SELECT TOP 1 colName FROM (SELECT colname,

row_number() OVER (ORDER BY (SELECT 0)) AS rowNumber

FROM myValues) myValues3 WHERE myValues3.rowNumber < myValues2.rowNumber

AND myValues3.rowNumber IS NOT NULL

AND myValues3.rowNumber<>'' ORDER BY myValues3.rowNumber DESC)

/**Selecting the priorNOT NULL value for a NULL value*/

ELSE myValues1.colName

/**Selecting the same value if is not NULL or an empty value*/

END AS colName FROM

(SELECT colName,

row_number() OVER (ORDER BY (SELECT 0)) AS rowNumber

FROM myValues) myValues1 /**Setting the row number as it is displayed*/

LEFT OUTER JOIN

(SELECT colName,

row_number() OVER (ORDER BY (SELECT 0)) AS rowNumber

FROM myValues) myValues2 /**Setting the row number as it is displayed*/

ON myValues1.rowNumber=myValues2.rowNumber+1 /**Joining in a way to get the previous value*/