Database learning #1

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SET NOCOUNT ON
    GO
  
  declare @t table(id int, baslangic datetime, bitis datetime, tekrar bit, gunluk bit, aralik_bas int, aralik_son int,zaman_id int)
    
    INSERT INTO @t VALUES (63, '2012-6-26 11:35:57', '2013-12-30 23:59:00', 1, 0, 1000, 8000, 1);
    INSERT INTO @t VALUES (16, '2012-6-5 11:44:15', '2013-12-30 23:59:00', 1, 0, 2010, 4310, 2);
    INSERT INTO @t VALUES (12, '2012-5-29 11:46:03', '2013-12-30 23:59:00', 1, 1, 565, 895, 3);
    INSERT INTO @t VALUES (16, '2012-7-4 10:14:15', '2013-11-10 23:59:00', 0, 0, 0, 0, 5);
    INSERT INTO @t VALUES (16, '2012-1-2 11:44:15', '2013-10-05 23:59:00', 0, 0, 0, 0, 7);
    
    declare @start_date datetime, @end_date datetime
    declare @weekMin int, @dayMin int,@hourMin int
    
    set @hourMin = 60
    set @dayMin = @hourMin*24
    set @weekMin = @dayMin*7
    
    set @start_date='1990-01-01 00:00'
    
    --select * from @t
    
    declare @curr_time datetime, @curr_time_inmins int, @remWeek int, @remDay int
    set @curr_time=CURRENT_TIMESTAMP
    set @curr_time_inmins = DATEDIFF(minute, @start_date,@curr_time)
    set @remWeek = @curr_time_inmins%@weekMin
    set @remDay = @curr_time_inmins%@dayMin
    
    
    SELECT * FROM @t WHERE (
    (@curr_time>baslangic AND @curr_time<bitis AND tekrar=0) OR
    (@curr_time>baslangic AND @curr_time<bitis AND @remWeek>=aralik_bas AND @remWeek<=aralik_son AND tekrar=1 AND gunluk = 0) OR
    (@curr_time>baslangic AND @curr_time<bitis AND @remDay>=aralik_bas AND @remDay<=aralik_son AND tekrar=1 AND gunluk = 1)) AND zaman_id=7

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