Databases
StackOverflow2013
Postsdbo
POSQL aggregate query with bit-field
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POSQL aggregate query with bit-field
    primarykey
    data
    text
    <p>I have an SQL table that looks like this:</p> <pre><code>ID uniqueidentifier ID_Task uniqueidentifier ID_Employee uniqueidentifier Comment nvarchar(256) Complete int Date datetime Days decimal(6, 2) Locked bit Created datetime Edited datetime Deleted bit </code></pre> <p>What I want to do is add up all of the "Days", for each Date, for a given ID_Employee. I managed to work out a query that looks like this:</p> <pre><code>SELECT CAST([Note].Date AS DATE) As Date, SUM([Note].Days) AS Total FROM Note WHERE [Note].ID_Employee = N'E6A0E609-F8B2-4B48-A17C-4A4E117A4077' GROUP BY CAST(Note.Date AS DATE) </code></pre> <p>This gives me a result set of the total "Days" for each unique "Date", such as:</p> <pre><code>2013-06-20 1.00 2013-06-21 0.75 </code></pre> <p>, showing employee E6A0E609-F8B2-4B48-A17C-4A4E117A4077 worked 1 man-day on the 20th and 3/4 of a man-day on the 21st. There can be any number of individual records for any day of the year, as a given employee might have worked different amounts of time on different ID_Tasks.</p> <p>Now what I want to do is add another field to the result set, that's "false" if any one of the records had "Locked" set to 1, else "true" if they were all 0. In simple language the question I'm wanting to ask the database is, "for all Date in the table, tell me the total Days worked and whether all records for that day have been Locked, for a given Employee". So what I want the result set to show is:</p> <pre><code>2013-06-20 1.00 TRUE 2013-06-21 0.75 FALSE </code></pre> <p>Meaning the employee has signed off his work for the 20th (TRUE, all records have 1 in the Locked bit-field), and one or more records not yet signed off for the 21st, meaning one or more records for this employee on the 21st have a 0 in the Locked bit-field).</p> <p>Did that make sense? Anyway, I can't get my head around the best way of doing this. </p> <p>Any SQL genius lurking who can assist?</p> <p>EDIT:</p> <p>OK, thanks to the ideas I got from the answers below, I added the CASE line to the query. Basically it says, "if the lowest number in Locked for any record on this date is zero, then not all the records have been signed off, else they all have been".</p> <pre><code>SELECT CAST([Note].Date AS DATE) As Date, SUM([Note].Days) AS Total, CASE MIN(CONVERT(INT, Locked)) WHEN 0 THEN 0 ELSE 1 END AS Locked FROM Note WHERE [Note].ID_Employee = N'E6A0E609-F8B2-4B48-A17C-4A4E117A4077' GROUP BY CAST(Note.Date AS DATE) </code></pre>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USRobinson
    1. USRobinson
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. COHow about `newColumn = CASE MAX(Locked) WHEN 0 THEN 'true' ELSE 'false' END`
      singulars
      1. POSQL aggregate query with bit-field
      1. USAaron Bertrand
    2. COnewColumn = CASE MAX(CONVERT(INT, Locked)) WHEN 0 THEN 'true' ELSE 'false' END
      singulars
      1. POSQL aggregate query with bit-field
      1. USgareththegeek
    3. COI think he wants TRUE only when ALL "Locked" values are 1... which is the same as saying FALSE when ANY "locked" value is 0. so, building on Aaron & Gareth's suggestions: newColumn = CASE MIN(CONVERT(INT, Locked)) WHEN 0 THEN 'FALSE' ELSE 'TRUE' END
      singulars
      1. POSQL aggregate query with bit-field
      1. USKevin Suchlicki
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload