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quick random row selection in Postgres
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You might want to experiment with OFFSET, as in
SELECT myid FROM mytable OFFSET floor(random()*N) LIMIT 1;
The N is the number of rows in mytable. You may need to first do a SELECT COUNT(*) to figure out the value of N.
Update (by Antony Hatchkins)
You must use floor he...
Nodejs - Redirect url
... @Magic Not true. Try Location: / and it would redirect you to the root folder.
– user3459110
Oct 24 '14 at 5:35
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Uncaught ReferenceError: jQuery is not defined [duplicate]
...One clarification, you won't see the error until you look at the homepage (root of site).
– zeusstl
May 1 '16 at 19:18
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show 2 more comment...
Display names of all constraints for a table in Oracle SQL
...CONS_COLUMNS view to see the table columns and corresponding constraints:
SELECT *
FROM user_cons_columns
WHERE table_name = '<your table name>';
FYI, unless you specifically created your table with a lower case name (using double quotes) then the table name will be defaulted to upper ca...
Linq to Entities - SQL “IN” clause
... be used interchangeably depending on your preference:
Query Syntax:
var selected = from u in users
where new[] { "Admin", "User", "Limited" }.Contains(u.User_Rights)
select u
foreach(user u in selected)
{
//Do your stuff on each selected user;
}
Method Syntax:...
jQuery or CSS selector to select all IDs that start with some string [duplicate]
How can I select all elements whose id starts with "player_"?
4 Answers
4
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How to avoid null checking in Java?
...en just disable them. No one implied that the behaviour is not documented. MySQL is written in C where dereferencing null pointers is undefined behaviour, nothing like throwing an exception.
– fgb
Apr 8 '13 at 0:39
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How to select bottom most rows?
I can do SELECT TOP (200) ... but why not BOTTOM (200)?
14 Answers
14
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How can I disable the Maven Javadoc plugin from the command line?
... It also works to add these to the release plugin config in the root-level pom.xml: <configuration><arguments>-DskipTests -Dmaven.javadoc.skip=true</arguments></configuration>
– nclark
May 11 '16 at 14:17
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What are the differences between poll and select?
I am referring to the POSIX standard select and poll system C API calls.
3 Answers
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