Question

I have table1 on which I do this query

SELECT DATE_FORMAT(FROM_UNIXTIME(t.TSTAMP), "%Y-%m") AS "timePeriod", COUNT(*) AS "prod1"

gives a perfect me 2 column result with col’timePeriod’ and col’prod1′. I would now like to update table2.prod1 where primary key is ‘timePeriod’.

I tried

Answer 1

This will do as you specified

INSERT 
IGNORE // include this if you want conflicts to be ignored
INTO table2 (
    timePeriod,
    prod1
)
SELECT 
    DATE_FORMAT(FROM_UNIXTIME(t.TSTAMP), "%Y-%m"),
    COUNT(*)

// you didn't include a "FROM" so added relevant place here
FROM table1 

// Include this if you want conflicts to append to the existing row
ON DUPLICATE KEY UPDATE prod1 = prod1 + VALUES(prod1) 

// Include this if you want conflicts to replace the existing row
ON DUPLICATE KEY UPDATE prod1 = VALUES(prod1)