Databases
StackOverflow2013
Postsdbo
PODynamically pick field to select data from
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PODynamically pick field to select data from
    primarykey
    data
    text
    <p>Say I have a table with three columns primaryNum, secondaryNum, chosenNum. primarynum and secondaryNum are both number values but chosenNum's value can either be "primaryNum", "secondaryNum", or "both".</p> <p>The chosenNum field is a column that gives me the option to search for a number in a particular field. </p> <p>For example: I might want to try to find all rows with the value 10 in the column that is stored in chosenNum. If the value of chosenNum is "both" then the row would be returned if either column (primaryNum, secondaryNum) had a value of 10.</p> <p>What might my select statement look like?</p> <hr> <hr> <p>It might be a better scenario if I say I would like to do a select statement like:</p> <p>SELECT * FROM aTable WHERE (SELECT bVal FROM bTable WHERE aVal = @varField ) = 0;</p> <p>Where @varField is the value of the value in the field with the label stored in chosenNum or either field if chosenNum = "both"</p> <p>This would result in me getting back rows with id 1,2,3,4,6,7,14,15,16,19,20,21,23,24,27</p> <p>Table A: Create</p> <pre><code>CREATE TABLE `test`.`aTable` ( `id` INT NOT NULL AUTO_INCREMENT , `primaryNum` INT NULL , `secondaryNum` INT NULL , `chosenNum` CHAR(12) NULL , PRIMARY KEY (`id`) ); </code></pre> <p>Table B: Create</p> <pre><code>CREATE TABLE `test`.`bTable` ( `aVal` INT NULL , `bVal` INT NULL ); </code></pre> <p>Table A: Data</p> <pre><code>INSERT INTO test.aTable VALUES (1,8,7,'secondaryNum'),(2,2,9,'secondaryNum'),(3,7,9,'both'),(4,5,1,'both'),(5,10,3,'secondaryNum'),(6,10,6,'both'),(7,7,8,'both'),(8,10,2,'primaryNum'),(9,2,1,'secondaryNum'),(10,7,2,'secondaryNum'),(11,2,2,'secondaryNum'),(12,5,1,'secondaryNum'),(13,1,6,'primaryNum'),(14,6,6,'both'),(15,4,9,'both'),(16,9,7,'primaryNum'),(17,8,3,'secondaryNum'),(18,10,7,'primaryNum'),(19,8,5,'secondaryNum'),(20,1,7,'both'),(21,7,9,'both'),(22,8,3,'primaryNum'),(23,6,2,'primaryNum'),(24,5,7,'both'),(25,2,1,'both'),(26,5,2,'secondaryNum'),(27,7,8,'primaryNum'); </code></pre> <p>Table B: Data</p> <pre><code>INSERT INTO test.bTable VALUES (1,1),(2,1),(3,1),(4,1),(5,0),(6,0),(7,0),(8,1),(9,0),(10,1); </code></pre>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USdonL
    1. USdonL
    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. VO
      singulars
      1. PODynamically pick field to select data from
      1. This table or related slice is empty.
      1. VTUpMod
    1. COPlease provide sample data and desired output.
      singulars
      1. PODynamically pick field to select data from
      1. USRedFilter
 

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