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Is there a way to split sql results by year?

Date : September 14 2020, 09:00 PM
this will help I currently have the following SQL statement: , Just add the project year to the SELECT and GROUP BY clauses:
code :
    YEAR([Project].[CurrentStatusDt]) PojectYear,
    COUNT([Project].[ProjectId]) AS TotalProjects
FROM [Project]
INNER JOIN [Manager] ON [Project].[ManagerId] = [Manager].[ManagerId]
WHERE [Project].[CurrentStatusId] = 5
GROUP BY [Manager].[Name], YEAR([Project].[CurrentStatusDt])
        WHEN [Project].[CurrentStatusDt] < CAST('2019-01-01' AS DATE)
        THEN 1 
        ELSE 0 
    END) TotalProjects2018,
        WHEN [Project].[CurrentStatusDt] >= CAST('2019-01-01' AS DATE)
        THEN 1 
        ELSE 0 
    END) TotalProjects2019
FROM [Project]
INNER JOIN [Manager] ON [Project].[ManagerId] = [Manager].[ManagerId]
    [Project].[CurrentStatusId] = 5 
    AND [Project].[CurrentStatusDt] >= CAST('2018-01-01' AS DATE)
    AND [Project].[CurrentStatusDt] <  CAST('2020-01-01' AS DATE)
GROUP BY [Manager].[Name]

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Problem with leap year in MS SQL giving different results for same year

By : funnytrees
Date : March 29 2020, 07:55 AM
Does that help Year() function returns value of INT datatype. Your function expects DATETIME value

How to Split Year month Day,if Year does not exist in the given string using c#?

By : Philipp
Date : March 29 2020, 07:55 AM
this one helps. Here the below code am working for Split the number from the given string and stores the correspond integer into combobox.That working Perfect.But i want to know ,If Year does not exist in the string,how to assign Year as Zero and the next integer for month strores in second combobox , You can do with Regex like this
code :
int combBox1, combBox2, combBox3;
var sample = "1Year(s)4month(s)2DaY(s)";

var yearString = Regex.Match(sample, @"\d+Year", RegexOptions.IgnoreCase).Value;
if (!string.IsNullOrEmpty(yearString))
    combBox1 = int.Parse(Regex.Match(yearString, @"\d+").Value);
var monthString = Regex.Match(sample, @"\d+Month", RegexOptions.IgnoreCase).Value;
if (!string.IsNullOrEmpty(monthString))
    combBox2 = int.Parse(Regex.Match(monthString, @"\d+").Value);
var dayStrings = Regex.Match(sample, @"\d+Day", RegexOptions.IgnoreCase).Value;
if (!string.IsNullOrEmpty(dayStrings))
    combBox3 = int.Parse(Regex.Match(dayStrings, @"\d+").Value);

Concatenate SQL Results by Year (Year, Make, Model)

By : Tomotaka Ogino
Date : March 29 2020, 07:55 AM
will be helpful for those in need I Have change it again. please test it and let me know if it works. Sorry for the bad SQL before. i forgot to initialize the variables at the first time.
code :
     make, model, submodel, notes
    (SELECT @ldfnr:= IF((@old_make = tab.make
      AND @old_model = tab.model
      AND @old_submodel = tab.submodel
      AND @old_notes = tab.notes
      AND (@old_year = tab.`year`
      OR @old_year = tab.`year`-1)) , @ldfnr, @ldfnr+1) AS nr, tab.* ,
      @old_make := tab.make , @old_model := tab.model ,
      @old_submodel := tab.submodel , @old_notes := tab.notes ,
      @old_year := tab.`year`
    FROM TableName AS tab,
      (SELECT @ldfnr:=0, @old_model:='', @old_submodel:='', @old_notes:='', @old_year:='', @old_make:=''  ) AS tmp
    ORDER BY make, model, submodel, notes, `YEAR` ASC) AS mytab
  ORDER BY nr;

| sku  | YEAR      | make      | model | submodel | notes                                    |
|    1 | 1995-1997 | Chevrolet | Astro | Base     | Clear Lens; Chrome Housing; Pair; 1 pc.; |
|    1 | 2001      | Chevrolet | Astro | Base     | Clear Lens; Chrome Housing; Pair; 1 pc.; |
|    1 | 1995-1996 | Chevrolet | Astro | CL       | Clear Lens; Chrome Housing; Pair; 1 pc.; |
|    1 | 1995-1996 | Chevrolet | Astro | LS       | Clear Lens; Chrome Housing; Pair; 1 pc.; |
|    1 | 1997      | Chevrolet | Astro | LT       | Clear Lens; Chrome Housing; Pair; 1 pc.; |
5 rows in set (0.44 sec)

Subsetting by year gives different results using ymd() vs. year()

By : Mike Morales
Date : March 29 2020, 07:55 AM
I wish did fix the issue. Looking over the problem some more it looks like: ymd("2010-12-31") is 12:00 AM on the 31st and not 12 PM.
There are 2 options which I see a possible solutions. Use the next day in the filter or covert all of your date/times to just dates with GMT.
code :

teaSet <- fread("teaSet.csv", na.strings=c("NA","N/A", ""))
teaSet$opened <- ymd_hms(teaSet$opened, tz = "")
teaSet$year <- as.factor(teaSet$year) 

ymd2010 <- teaSet[opened >= ymd("2010-01-01") & opened < ymd("2011-1-1"),]

#a second possible option - not as clean as the prior one
teaSet$opened <- ymd_hms(teaSet$opened, tz = "GMT")
ymd2010_2 <-teaSet[as.Date(opened) >= ymd("2010-01-01") & as.Date(opened) <= ymd("2010-12-31")]

year2010 <- teaSet[year(opened)==2010,]

print( dim(year2010 ))

"ratchet" function: replace previous year's results only if next year's results are greater

By : Ahmed Hamdy
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further I need to loop through years in a df and replace values in another column (percentpp) only if the next year's percentpp is larger. Once a cell has reached a high value, it cannot go back down - only up, like a ratchet. , You can use cummax.
With base R:
code :
df <- df[order(df$year), ]
df$percentpp <- ave(df$percentpp, df$cell_id, FUN = cummax)

df <- df %>%
  group_by(cell_id) %>%
  arrange(year) %>%
  mutate(percentpp = cummax(percentpp)) %>%
df <- read.table(text = "
  cell_id   year    percentpp
1   40      2011    3
2   41      2011    1
3   42      2011    0
4   43      2011    0
5   40      2012    1
6   41      2012    5
7   42      2012    1   
8   43      2012    5
9   40      2013    2
10  41      2013    2
11  42      2013    2
12  43      2013    0
13  40      2014    2   
14  41      2014    3   
15  42      2014    3   
16  43      2014    3 
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