Table 1
CustID, date contact, filter
101, 1-Jan-17, Y
102, 2-Jan-17, N
103, 3-Jan-17, A
104, 4-Jan-17, A
Table 2
CustID, date contact, filter
101, 2-Jan-17, N
102, 2-Jan-17, Y
103,
104, 4-Jan-17, N
Result
CustID ,date contact ,filter
101, 2-Jan-17, Y
102, 2-Jan-17, Y
103, 3-Jan-17, A
104, 4-Jan-17, N
CASE
WHEN coalesce (1.date_contact,2.date_contact) is not null then max (1.date_contact,2.date_contact)
END AS date_contact FORMAT DATE9.
CASE
WHEN coalesce (1.filter,2.filter) is not null then max (1.filter,2.filter)
END AS filter
Question: i can get the latest date for date_contact when comparing table 1 and 2 but why not for filter??
my result for filter is y>n>a>null
1-Why the duplication? See https://communities.sas.com/t5/forums/editpage/board-id/general_program/message-id/47215
2-No need for coalesce() as SAS will ignore missing values (there are no null values in SAS)
Hi ChrisNZ, unable to open the link, able to send again. thanks
that's the link to your other, similar, question
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