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Derived column expression meaning in ssis

Please let me know the actual purpose, I am trying to understand from an existing package
1)ISNULL(ESN) ? (DT_WSTR,50)"Accessories" : "Phone"

2)(DT_DBTimeStamp)((SUBSTRING((DT_WSTR,8)[Receive Date],5,2) + "-" + SUBSTRING((DT_WSTR,8)[Receive Date],7,2) + "-" + SUBSTRING((DT_WSTR,8)[Receive Date],1,4)))

3)ISNULL(ESN) ? REPLACE(SKU,SUBSTRING(SKU,1,FINDSTRING(SKU," ",1)),"") : SKU
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sqlcurious
Asked:
sqlcurious
1 Solution
 
lozzamooreCommented:
1) If the ESN field is null, then return "Accessories", otherwise return "Phone".

2) Manufacture a datetime string in the format: DD-MM-YYYY (or could be MM-DD-YYYY depending on the original format) setting DD as 5th and 6th characters, MM as 7th and 8th characters, and YYYY as the 1st 4 characters from the "Receive Date" column.

3) If the ESN field is null, then return the first part of the SKU field up to the space, otherwise return the whole field.
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sqlcuriousAuthor Commented:
thanks
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