Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>This SQL statement seems to get what you want (t is the table name of the sampe table):</p> <pre><code>SELECT d.id, d.duration, d.duration - IFNULL( ( SELECT Sum( timestampdiff( SQL_TSI_DAY, no_hold.d2, ( SELECT min(d1) FROM t t4 WHERE t4.id = no_hold.id and t4.d1 &gt; no_hold.d2 ))) FROM ( SELECT DISTINCT id, d2 FROM t t1 WHERE ( SELECT sum( IIF( t1.d2 between t2.d1 and t2.d2, 1, 0 ) ) FROM t t2 WHERE t2.id = t1.id and t2.d2 &lt;&gt; t1.d2 ) = 0 And d2 &lt;&gt; ( select max( d2 ) from t t3 where t3.id = t1.id )) no_hold WHERE no_hold.id = d.id ), 0 ) "parts hold" FROM ( SELECT id, timestampdiff( SQL_TSI_DAY, min( d1 ), max( d2 ) ) duration FROM t GROUP BY id ) d </code></pre> <p>The outer query gets the duration of the repair work. The complex subquery calculates the total number of days not waiting for parts. This is done by locating the start dates where the vehicle is not waiting for parts, and then count the number of days until it begins to wait for parts again:</p> <pre><code>// 1) The query for finding the starting dates when the vehicle is not waiting for parts, // i.e. finding all d2 that is not within any date range where the vehicle is waiting for part. // The DISTINCT is needed to removed duplicate starting "no hold" period. SELECT DISTINCT id, d2 FROM t t1 WHERE ( SELECT sum( IIF( t1.d2 between t2.d1 and t2.d2, 1, 0 ) ) from t t2 WHERE t2.id = t1.id and t2.d2 &lt;&gt; t1.d2 ) = 0 AND d2 &lt;&gt; ( SELECT max( d2 ) FROM t t3 WHERE t3.id = t1.id ) ) </code></pre> <p>// 2) The days where it vehicle is not waiting for part is the date from the above query till the vehicle is // waiting for part again</p> <pre><code>timestampdiff( SQL_TSI_DAY, no_hold.d2, ( SELECT min(d1) FROM t t4 WHERE t4.id = no_hold.id and t4.d1 &gt; no_hold.d2 ) ) </code></pre> <p>Combining the two above and aggregating all such periods gives the number of days that the vehicle is not waiting for parts. The final query adds an extra condition to calculate result for each id from the outer query.</p> <p>This probably is not terribly efficient on very large table with many ids. It should fine if the id is limited to one or just a few.</p>
    singulars
    1. This table or related slice is empty.
    1. POSQL to find time elapsed from multiple overlapping intervals
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USAlex W
    1. USAlex W
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POSQL to find time elapsed from multiple overlapping intervals
      singulars
      1. PTQuestion
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTAcceptedByOriginator
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. COWow, that is beautiful!
      singulars
      1. PO
      1. USjon
    2. COEdited to fix problem with duplicate starting date of "no hold" periods.
      singulars
      1. PO
      1. USAlex W
    3. COAlex: in the main code block above, missing a right paren after
      singulars
      1. PO
      1. USjon
 

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