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postgreSQL SELECT the last day of month

You can select the last day of month.

SELECT (date_trunc('MONTH', ('201608'||'01')::date) + INTERVAL '1 MONTH - 1 day')::DATE;

201608 is replaceable with a variable.

Count the number of records per week

SELECT date_trunc('week', <>) AS "Week" , count(*) FROM <> GROUP BY 1 ORDER BY 1;


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