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What's the difference between TRUNCATE and DELETE in SQL
...tranTest | DELETE FROM tranTest |
| SELECT * FROM tranTest | SELECT * FROM tranTest |
| ROLLBACK | ROLLBACK |
| SELECT * FROM tranTest | SELE...
Is this a “good enough” random algorithm; why isn't it used if it's faster?
... |12000%n", name);
for (int i = 0; i < 10; i++) {
char[] bar = " ".toCharArray(); // 50 chars.
Arrays.fill(bar, 0, Math.max(0, Math.min(50, frequencies[i] / 100 - 80)), '#');
System.out.printf("0.%dxxx:...
XPath: select text node
... XML:
<node>Text1<subnode/>text2</node>
How do I select either the first or
the second text node via XPath?
Use:
/node/text()
This selects all text-node children of the top element (named "node") of the XML document.
/node/text()[1]
This selects the first text-nod...
Nested select statement in SQL Server
...
You need to alias the subquery.
SELECT name FROM (SELECT name FROM agentinformation) a
or to be more explicit
SELECT a.name FROM (SELECT name FROM agentinformation) a
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Which data type for latitude and longitude?
...e using gist (geog);
and then request, say, 5 closest to a given point:
select *
from your_table
order by geog <-> 'SRID=4326;POINT(lon lat)'
limit 5;
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improve this answer
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how do I query sql for a latest record date for each user
...
select t.username, t.date, t.value
from MyTable t
inner join (
select username, max(date) as MaxDate
from MyTable
group by username
) tm on t.username = tm.username and t.date = tm.MaxDate
...
What is the format specifier for unsigned short int?
...ntf" short ints because they are automatically promoted to ints (just like chars).
– Alexey Frunze
Jan 2 '12 at 11:00
2
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Linq: What is the difference between Select and Where
The Select and Where methods are available in Linq. What should every developer know about these two methods? For example: when to use one over the other, any advantages of using one over the other, etc.
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MySQL integer field is returned as string in PHP
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When you select data from a MySQL database using PHP the datatype will always be converted to a string. You can convert it back to an integer using the following code:
$id = (int) $row['userid'];
Or by using the function intval():
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MySQL Like multiple values
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To get the regexp value from a column: (select group_concat(myColumn separator '|') from..)
– daVe
Nov 28 '15 at 1:06
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