大约有 40,000 项符合查询结果（耗时：0.0280秒） [XML]
Hidden Features of SQL Server
...T clause allows to do this very easily - it allows access to the "virtual" tables called inserted and deleted (like in triggers):
DELETE FROM (table)
OUTPUT deleted.ID, deleted.Description
WHERE (condition)
If you're inserting values into a table which has an INT IDENTITY primary key field, with ...
Function to Calculate Median in SQL Server
... the 7 years since, but personally I wouldn't use this function on a large table until I verified its performance vs. other solutions.
ORIGINAL 2009 POST IS BELOW:
There are lots of ways to do this, with dramatically varying performance. Here's one particularly well-optimized solution, from Median...
How to convert numbers between hexadecimal and decimal
...on from hex to decimal number, you can use the approach with pre-populated table of hex-to-decimal values.
Here is the code that illustrates that idea. My performance tests showed that it can be 20%-40% faster than Convert.ToInt32(...):
class TableConvert
{
static sbyte[] unhex_table =
...
How to make fill height
...
position: absolute;
bottom: 0;
right: 0;
}
With the table cell markup like so:
<td class="thatSetsABackground">
<div class="thatSetsABackgroundWithAnIcon">
<dl>
<dt>yada
</dt>
<dd>yada
</dd>
<...
初窥InnoDB的Memcached插件 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...件所需要的配置信息：
mysql> USE innodb_memcache
mysql> SHOW TABLES;
+---------------------------+
| Tables_in_innodb_memcache |
+---------------------------+
| cache_policies |
| config_options |
| containers |
+---------------------------+
...
Should I commit or rollback a read transaction?
...
Suppose I create a temp table, populate it with ids, join it with a data table to select the data that goes with the ids, then delete the temp table. I'm really just reading data, and I don't care what happens to the temp table, since it's temporar...
Hibernate dialect for Oracle Database 11g?
...
Unfortunately does not help for "ORA-01754: a table may contain only one column of type LONG".
– Jan Goyvaerts
Mar 6 '13 at 10:52
...
Is storing a delimited list in a database column really that bad?
...m in a comma separated list of values stored in one column of the database table.
10 Answers
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Detect if value is number in MySQL
...
This should work in most cases.
SELECT * FROM myTable WHERE concat('',col1 * 1) = col1
It doesn't work for non-standard numbers like
1e4
1.2e5
123. (trailing decimal)
share
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...
Cleanest way to build an SQL string in Java
...pared statements:
PreparedStatement stm = c.prepareStatement("UPDATE user_table SET name=? WHERE id=?");
stm.setString(1, "the name");
stm.setInt(2, 345);
stm.executeUpdate();
The other thing that can be done is to keep all queries in properties file. For example
in a queries.properties file can ...