Databases
StackOverflow2013
Postsdbo
POsql compare entries with differents parameters
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POsql compare entries with differents parameters
    primarykey
    data
    text
    <p>Here we are comparing entries in table</p> <pre><code>CREATE TABLE a (id INT PRIMARY KEY, p1 INT, p2 INT, p3 INT, .. , p15 INT) </code></pre> <p>p(n) takes the value from 0 to 2</p> <p>I have to get all entries with unique combinations of parameteres. It's not difficult task, so I created a table like this</p> <pre><code>CREATE TEMPORARY TABLE b AS (SELECT t1.id, t2.p1, t2.p2, t2.p3, t2.p4, t2.p5, t2.p6, t2.p7, t2.p8, t2.p9, t2.p10, t2.p11, t2.p12, t2.p13, t2.p14, t2.p15 FROM ( SELECT p1, p2, p3, p4, p5, p6, p7, p8, p9, p10, p11, p12, p13, p14, p15 FROM a GROUP BY p1, p2, p3, p4, p5, p6, p7, p8, p9, p10, p11, p12, p13, p14, p15 HAVING COUNT(*) = 1 )t2 LEFT JOIN a t1 on t2.p1 = t1.p1 AND t2.p2 = t1.p2 AND t2.p3 = t1.p3 AND t2.p4 = t1.p4 AND t2.p5 = t1.p5 AND t2.p6 = t1.p6 AND t2.p7 = t1.p7 AND t2.p8 = t1.p8 AND t2.p9 = t1.p9 AND t2.p10 = t1.p10 AND t2.p11 = t1.p11 AND t2.p12 = t1.p12 AND t2.p13 = t1.p13 AND t2.p14 = t1.p14 AND t2.p15 = t1.p15) </code></pre> <p>Here we are get enries with unique combination of parameters.</p> <p>Next step is for each record in table A to find all records from the table B that differ by one, two and three parameters. Records differ by a single parameter should be no more than one, records for two different parametres no more than two etc.</p> <p>For example:</p> <pre><code> id | p(n) -----+---------------- 1 |000000000000000 2 |000000000000001 </code></pre> <p>I created a temporary table of the form</p> <pre><code>CREATE TEMPORARY TABLE c AS ( SELECT cnt, id1, id2 FROM ( SELECT (t1.p1 = t2.p1)+(t1.p2 = t2.p2) +(t1.p3 = t2.p3) +(t1.p4 = t2.p4) +(t1.p5 = t2.p5) +(t1.p6 = t2.p6) +(t1.p7 = t2.p7) +(t1.p8 = t2.p8) +(t1.p9 = t2.p9) +(t1.p10 = t2.p10) +(t1.p11 = t2.p11) +(t1.p12 = t2.p12) +(t1.p13 = t2.p13) +(t1.p14 = t2.p14) +(t1.p15 = t2.p15) AS cnt, t1.id id1, t2.id id2 FROM b AS t1, a AS t2 ) WHERE (cnt BETWEEN 12 AND 14) AND (id1 &lt; id2) ) </code></pre> <p>Here I get a table with pairs that differ by 1, 2 and 3 parameters</p> <p>But I ran into a problem entries in the table quite a lot about 100,000 entries. This table is too large (processed data on a home PC) and the creation of the table gives a very long one.</p> <p>Perhaps this is the only way to get everything, but can anyone have any idea of the analytical method of solving this problem than brute force couples (maybe not SQL). Of course, that will be solved much faster...</p> <p>Any hint will be appreciated! Thank you!</p>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. USRoman Pekar
    1. USAlexander Khe
    plurals
    1. PL
      singulars
      1. LTLinked
    2. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POsql compare entries with differents parameters
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POsql compare entries with differents parameters
      1. This table or related slice is empty.
      1. VTDownMod
    3. VO
      singulars
      1. POsql compare entries with differents parameters
      1. This table or related slice is empty.
      1. VTUpMod
    1. This table or related slice is empty.
 

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