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select * from 表名
	where to_days(时间字段名) = to_days(now());

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SELECT * FROM 表名
	WHERE TO_DAYS( NOW( ) ) - TO_DAYS( 时间字段名) <= 1

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SELECT * FROM 表名
	where DATE_SUB(
		CURDATE(),
		INTERVAL 7 DAY
	) <= date(时间字段名)

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SELECT * FROM 表名
	where
	DATE_SUB(
		CURDATE(),
		INTERVAL 30 DAY
	) <= date(时间字段名)

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SELECT * FROM 表名
	WHERE
	DATE_FORMAT( 时间字段名, '%Y%m' ) = DATE_FORMAT( CURDATE( ) , '%Y%m' )

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SELECT * FROM 表名
	WHERE
	PERIOD_DIFF(
		date_format( now( ) , '%Y%m' ),
		date_format( 时间字段名, '%Y%m' )
	 ) =1

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select * from `ht_invoice_information`
	where QUARTER(create_date)=QUARTER(now());

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select * from `ht_invoice_information`
	where
	QUARTER(create_date)=QUARTER(DATE_SUB(now(),interval 1 QUARTER));

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select * from `ht_invoice_information`
	where
	YEAR(create_date)=YEAR(NOW());

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select * from `ht_invoice_information`
	where
	year(create_date)=year(date_sub(now(),interval 1 year));

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SELECT name,submittime FROM enterprise
	WHERE
	YEARWEEK(date_format(submittime,'%Y-%m-%d')) = YEARWEEK(now());

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SELECT name,submittime FROM enterprise
	WHERE
	YEARWEEK(date_format(submittime,'%Y-%m-%d')) = YEARWEEK(now())-1;

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select name,submittime from enterprise
	where
	date_format(submittime,'%Y-%m')=date_format(DATE_SUB(curdate(), INTERVAL 1 MONTH),'%Y-%m')

select * from user
	where
	DATE_FORMAT(pudate,'%Y%m') = DATE_FORMAT(CURDATE(),'%Y%m') ;

select * from user
	where
	WEEKOFYEAR(FROM_UNIXTIME(pudate,'%y-%m-%d')) = WEEKOFYEAR(now())

select * from user
	where
	MONTH(FROM_UNIXTIME(pudate,'%y-%m-%d')) = MONTH(now())

select * from user
	where
	YEAR(FROM_UNIXTIME(pudate,'%y-%m-%d')) = YEAR(now()) and MONTH(FROM_UNIXTIME(pudate,'%y-%m-%d')) = MONTH(now())

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select name,submittime from enterprise
	where
	date_format(submittime,'%Y-%m')=date_format(now(),'%Y-%m')

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select name,submittime from enterprise
	where
	submittime between date_sub(now(),interval 6 month) and now();