Databases
StackOverflow2013
Postsdbo
POGet date even if it doesn't exist in table from SQL SELECT statement
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POGet date even if it doesn't exist in table from SQL SELECT statement
    primarykey
    data
    text
    <p>I have a table that stores the amount of errors according to what alarm-id it is. The table looks something like this:</p> <pre><code>|----DATE----|---ALARM_ID---|---COUNTER---| | 2012-01-01 | 1 | 32 | | 2012-01-01 | 2 | 28 | | 2012-01-02 | 1 | 12 | | 2012-01-02 | 2 | 23 | | 2012-01-03 | 1 | 3 | | 2012-01-03 | 2 | 9 | | 2012-01-05 | 1 | 8 | | 2012-01-05 | 2 | 1 | | 2012-01-07 | 1 | 102 | | 2012-01-07 | 2 | 78 | </code></pre> <p>Notice the gap between date (2012-01-03 - 2012-01-05) and (2012-01-05 - 2012-01-07). On these dates there isn't any data because the system, that my program is monitoring, haven't reported any errors at that date. What I'm looking for is a SQL SELECT query that returns the total amount of errors on each date, for example:</p> <pre><code>|----DATE----|---COUNTER---| | 2012-01-01 | 60 | | 2012-01-02 | 35 | | 2012-01-03 | 12 | | 2012-01-04 | 0 | | 2012-01-05 | 9 | | 2012-01-06 | 0 | | 2012-01-07 | 180 | </code></pre> <p>I have a query that returns ID's even if they doesn't exist in the table, and if the ID doesn't exist, return the ID anyway with the COUNTER value 0. As such:</p> <pre><code> BEFORE AFTER |---ID---|---COUNTER---| |---ID---|---COUNTER---| | 1 | 2 | | 1 | 2 | | 2 | 6 | | 2 | 6 | | 3 | 1 | --&gt; | 3 | 1 | | 5 | 9 | | 4 | 0 | | 6 | 10 | | 5 | 9 | | 6 | 10 | | 7 | 0 | | 8 | 0 | </code></pre> <p>The query goes like this:</p> <pre><code>select t.num as ID, coalesce(yt.COUNTER, 0) from all_stats yt right join ( select t1.num + t2.num * 10 + t3.num * 100 + t4.num * 1000 as num from ( select 1 as num union select 2 union select 3 union select 4 union select 5 union select 6 union select 7 union select 8 union select 9 union select 0 ) t1 cross join ( select 1 as num union select 2 union select 3 union select 4 union select 5 union select 6 union select 7 union select 8 union select 9 union select 0 ) t2 cross join ( select 1 as num union select 2 union select 3 union select 4 union select 5 union select 6 union select 7 union select 8 union select 9 union select 0 ) t3 cross join ( select 1 as num union select 2 union select 3 union select 4 union select 5 union select 6 union select 7 union select 8 union select 9 union select 0 ) t4 ) t on yt.ID = t.num where (t.num between (select min(ID) from all_stats) and (select max(ID) from all_stats)) order by ID </code></pre> <p>I can't figure out how I can change this query when it's regarding dates. Can someone please help me on this issue?</p> <p>I'm using MySQL</p> <p>Thanks in advance, Steve-O</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USClydeFrog
    1. USClydeFrog
    plurals
    1. PL
      singulars
      1. LTLinked
    2. PL
      singulars
      1. LTLinked
    1. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POGet date even if it doesn't exist in table from SQL SELECT statement
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POGet date even if it doesn't exist in table from SQL SELECT statement
      1. USkaj
      1. VTFavorite
    1. COWhich DBMS? (Oracle, PostgreSQL, SQL Server, MySQL, . . . ?)
      singulars
      1. POGet date even if it doesn't exist in table from SQL SELECT statement
      1. USruakh
    2. COI'm using MySQL
      singulars
      1. POGet date even if it doesn't exist in table from SQL SELECT statement
      1. USClydeFrog
 

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