Binary query to see if a date exists in a table
I have to tables
table1 and table2
each of these tables has date1 and date2 respectively.
I have a process where I append the daily records from table2 to table1. I want to make sure they are not duplicated.
to do this I was thinking on checking and seeing that any of the dates in table2 exists in table 1
If any of the dates in table2.date2 exists in table1.date1
(Block select statement 1)
else
(block select statement2)
endif
I just need some help with the first if statement. How do I write the query so that it checks if any of the values in date2 exists in date1 giving me a true or false value.
thanks
table1 and table2
each of these tables has date1 and date2 respectively.
I have a process where I append the daily records from table2 to table1. I want to make sure they are not duplicated.
to do this I was thinking on checking and seeing that any of the dates in table2 exists in table 1
If any of the dates in table2.date2 exists in table1.date1
(Block select statement 1)
else
(block select statement2)
endif
I just need some help with the first if statement. How do I write the query so that it checks if any of the values in date2 exists in date1 giving me a true or false value.
thanks
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Interesting ... I thought my earlier-posted answer was more complete.
INSERT INTO dbo.table1 (
date1, ...
)
SELECT
t2.date2, ...
FROM dbo.table2 t2
LEFT OUTER JOIN dbo.table1 t1 ON
t1.date1 = t2.date2
WHERE
t1.date1 IS NULL AND
t1.date1 >= '...' AND
t2.date2 >= '...'