How to do an UPSERT in Coral8

Assume that the LastTrades window has the retention policy of KEEP LAST PER Symbol.

Here is some code (provided by Mark of Coral8) to do an upsert.

INSERT INTO
LastTrades
SELECT
SPC.symbol,
SPC.price,
If LT.volume Is Null Then 0 Else LT.volume End If
FROM
StreamPriceCorrections SPC
Left Outer Join LastTrades LT ON SPC.Symbol = LT.Symbol;


If we need to do an update rather than an upsert, this piece of code works:


INSERT INTO
LastTrades
SELECT
SPC.symbol,
SPC.price,
LT.volume
FROM
StreamPriceCorrections SPC, LastTrades LT
ON SPC.Symbol = LT.Symbol;


©2008 Marc Adler - All Rights Reserved