插入到 MySQL table 当年的所有星期日和星期六

Question

我有一个很小的 table，里面只有 "fecha" 个字段。

我需要一个 MySQL 查询，将一年中的每个星期日和星期六插入到 table。

我自己的研究让我知道我需要做这样的事情：

DECLARE diaRecorrido date();
SET diaRecorrido = date(now());

WHILE DATEPART(WEEKDAY,diaRecorrido) = 1 or DATEPART(WEEKDAY,diaRecorrido) = 7
    BEGIN
        INSERT INTO feriados (fecha)
        VALUES (diaRecorrido)

    IF diaRecorrido=2017/01/01
    THEN
    LEAVE lazo;
    END IF;

    END;

非常感谢任何指导！

Answer 1

您可以创建一个数字 table，然后从中 select 您希望保留的日期：

DECLARE @Date1 DATE, @Date2 DATE
SET @Date1 = '20160101'
SET @Date2 = '20161231'

INSERT INTO feriados
SELECT DATEADD(DAY,number+1,@Date1) [Date]
FROM master..spt_values
WHERE type = 'P' AND
    DATEADD(DAY,number+1,@Date1) < @Date2 AND
    (DATEPART(WEEKDAY, DATEADD(DAY,number+1,@Date1)) = 1 OR
     DATEPART(WEEKDAY, DATEADD(DAY,number+1,@Date1)) = 7)

Answer 2

我认为，你应该使用 DAYOFWEEK()

create PROCEDURE generateSundayAndSaturday()
BEGIN
DECLARE _now DATETIME;
DECLARE _endYear DATETIME;    
SET _endYear = DATE_FORMAT(NOW() + INTERVAL 1 YEAR ,'%Y-01-01');
SELECT now() into _now from dual;    
while _now < _endYear DO
  if DAYOFWEEK(_now) = 7 THEN -- Saturday
    -- insert into
    SET _now = _now + INTERVAL 1 DAY;
  ELSEIF DAYOFWEEK(_now) = 1 THEN -- Sunday
    -- insert into
    SET _now = _now + INTERVAL 6 DAY;
  ELSE
    SET _now = _now + INTERVAL 1 DAY;
  END IF;
END WHILE;

结束；

Answer 3

这是 MS SQL (t-sql) 查询。我认为您可以修复 MySQL.

的小语法差异

declare @thisYear datetime=cast(year(getdate()) as varchar)+'-01-01',
@newyear datetime=cast(year(getdate())+1 as varchar)+'-01-01'
declare @frstSat datetime, @frstSun datetime

 select @frstSat= dateadd(dd,7-DATEPART(weekday,@thisYear),@thisYear) ,
@frstSun= case DATEPART(weekday,@thisYear)
when 1 then @thisYear --if 1/1 is Sunday
else dateadd(dd,8-DATEPART(weekday,@thisYear),@thisYear) end 

;with sat as (
select @frstSat dt,'Sat' WkDay
union all
select dateadd(dd,7,dt),'Sat' WkDay
from sat
where dateadd(dd,7,dt)<@newyear
)
,sun as (
select @frstSun dt,'Sun' WkDay
union all
select dateadd(dd,7,dt),'Sun' WkDay
from sun
where dateadd(dd,7,dt)<@newyear
)
--insert mytable
select * from sat
union
select * from sun
order by dt

插入到 MySQL table 当年的所有星期日和星期六

Insert into MySQL table all Sundays and Saturdays from current year

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date

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datepart