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How to concatenate columns in a Postgres SELECT?
... is not a valid operator for string concatenation in Postgres (or standard SQL). It's a private idea of Microsoft to add this to their products.
There is hardly any good reason to use character(n) (synonym: char(n)). Use text or varchar. Details:
Any downsides of using data type "text" for storin...
Correct way to pass multiple values for same parameter name in GET request
...eryset.filter(model_id__in=id_filter)
which roughly speaking performs the SQL equivalent of
WHERE model_id IN ('a', 'b')
with the first request
and,
WHERE model_id IN ('a')
with the second request.
This would work with more than 2 parameter values in the request as well !
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Type or namespace name does not exist [closed]
... faced the same issue with an ASP.NET MVC site when I tried to use LINQ to SQL. I fixed the problem by:
Solution Explorer -> References -> Right-click on System.Data.Linq -> Copy Local (True)
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Laravel - Eloquent or Fluent random row
...l 3:
User::order_by(DB::raw('RAND()'))->get();
Check this article on MySQL random rows. Laravel 5.2 supports this, for older version, there is no better solution then using RAW Queries.
edit 1: As mentioned by Double Gras, orderBy() doesn't allow anything else then ASC or DESC since this change....
How to find the mysql data directory from command line in windows
In linux I could find the mysql installation directory with the command which mysql . But I could not find any in windows. I tried echo %path% and it resulted many paths along with path to mysql bin.
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MySQL Conditional Insert
...s, dual is a table with one row only (found originally in Oracle, now in mysql too). The logic is that the SELECT statement generates a single row of data with the required values, but only when the values are not already found.
Alternatively, look at the MERGE statement.
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Postgresql: Scripting psql execution with password
How can I call psql so that it doesn't prompt for a password ?
15 Answers
15
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How to get the first five character of a String
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best alternative for LEFT function that we use in SQL Server
– vibs2006
Jan 20 at 13:04
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Lisp in the real world
...er". but in fact it's just a bunch of integrated common lisp libraries for sql connectivity and web applications. some details are available at cl-dwim project page
using that we have developed and operate a web application for the hungarian government that collect data from the local governments a...
How to get ERD diagram for an existing database?
I have a PostgreSQL database. I want to get its ERD. How can I do so?
12 Answers
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