In Postgres, is it possible to insert a constant combined with the result of SELECT?
Question
For example suppose I have a table TRADES as follows
DATE, PRICE, ...
I wish to construct a table TRADING_DAYS as follows
MARKET, DATE
With sample data as follows
NYSE, 2011-03-03
NYSE, 2011-03-04
NYSE, 2011-03-05
Is it possible to write a query that extracts DATE from TRADES, combines it with the constant 'NYSE' and inserts into TRADING_DAYS?
2 answers
solution1
6 ACCPTED 2011-08-04 07:09:30
INSERT INTO TRADING_DAYS
SELECT 'NYSE', DATE
FROM TRADES
But I guess you want the distinct dates rather then duplicates?
INSERT INTO TRADING_DAYS
SELECT DISTINCT 'NYSE', DATE
FROM TRADES
solution2
1 2011-08-04 07:10:32
INSERT INTO TRADING_DAYS SELECT 'NYSE', DATE FROM TRADES
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