Postgresql 按本年度,本月份,本周,今天统计数据

Postgresql 按本年度,本月份,本周,今天统计数据

具体的函数和例子可见下面的官网参考

postgresql-参考文章

-- 统计本年的数据,按月份展示
SELECT COUNT
	( tfn.* ),
	EXTRACT ( MONTH FROM tfn.d_logdate ) log_month
FROM
	log_func_tb tfn 
WHERE
	EXTRACT ( YEAR FROM tfn.d_logdate ) = EXTRACT ( YEAR FROM NOW( ) ) 
GROUP BY
	EXTRACT ( MONTH FROM tfn.d_logdate )

-- 统计本月的数据,按天(1-31)展示
SELECT COUNT
	( tfn.* ),
	EXTRACT ( DAY FROM tfn.d_logdate ) log_day
FROM
	log_func_tb tfn 
WHERE
	EXTRACT ( YEAR FROM tfn.d_logdate ) = EXTRACT ( YEAR FROM NOW( ) ) 
	AND EXTRACT ( month FROM tfn.d_logdate ) = EXTRACT ( month FROM NOW( ) ) 
GROUP BY
	EXTRACT ( DAY FROM tfn.d_logdate )

注意:

• DOW 周日(0) -> 周一 (6) // 下面没有使用
• isodow 周一(1) -> 周日 (7)

-- 统计本周的数据,按星期几展示
SELECT COUNT
	( tfn.* ),
	EXTRACT ( isodow FROM tfn.d_logdate ) log_isodow
FROM
	log_func_tb tfn 
WHERE
	EXTRACT ( YEAR FROM tfn.d_logdate ) = EXTRACT ( YEAR FROM NOW( ) ) 
	AND EXTRACT ( WEEK FROM tfn.d_logdate ) = EXTRACT ( WEEK FROM NOW( ) ) 
GROUP BY
	EXTRACT ( isodow FROM tfn.d_logdate )

-- 统计今天的数据,按小时展示
SELECT COUNT
	( tfn.* ),
	EXTRACT ( HOUR FROM tfn.d_logdate ) log_hour 
FROM
	log_func_tb tfn 
WHERE
	DATE ( tfn.d_logdate ) = CURRENT_DATE 
GROUP BY
	EXTRACT (
	HOUR 
	FROM
	tfn.d_logdate 
	)