Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>This is by design in the SQL dialects I can think of offhand. I know several people who, out of habit, add <code>order by 0 desc</code> or <code>order by 1</code> to ad hoc queries, the first to pick what typically is the ID column and the second what is often a "Name" column or similar. They're querying based on the ordinal position of the field in the query (or the schema, in the case of *)</p> <p>In order to get a column <em>named</em> 5, you need to use the appropriate SQL quoting mechanism for your dialect and configuration. As an example, Microsoft Sql and Access would typically use <code>select * from tablecomments where [5]=5</code>; in Postgres and Oracle you'd use <code>select * from tablecomments where "5"=5</code>, and in Mysql, Quoted Identifiers are quoted with a backtick <code>select * from tablecomments where `5`=5</code>. In Microsoft SQL you can also make things more like Oracle and Postgres if your session has SET QUOTED_IDENTIFIER ON, in which case you'd use quotes instead of square brackets.</p> <p>As an aside, but a very important one, you should not take user input and directly embed it in SQL. If someone were to intercept the HTTP transmission between your Android app and your PHP app (trivial with a proxy like Charles or Fiddler), they'd be able to replay the http request with arbitrary SQL injected. As other commenters have noted, please use a parameterized query instead.</p> <p>Since you're trying to modify the query itself rather than the parameters, you may need to consider whitelisting the allowed field names (or compare the string you're sent against the fields represented in the schema).</p>
    singulars
    1. This table or related slice is empty.
    1. POI try to query a mysql column which has the name "5". This outputs the wrong column which has the name "22"
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USJasonTrue
    1. USJasonTrue
    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. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. COIn MySql it's backticks not double quotes. Postgres is double quotes. Can't speak for Oracle
      singulars
      1. PO
      1. USBasic
    2. COCorrected. My memory of MySql is hazy, involving lots of whacking my head against the table.
      singulars
      1. PO
      1. USJasonTrue
    3. CO+1 for the detailed explanation; **but** the OP's code already seems to contain back-ticks...
      singulars
      1. PO
      1. USIMSoP
 

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