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Count table rows
...noDB, this value is
an approximation, and may vary from the actual value by as much as 40%
to 50%. In such cases, use SELECT COUNT(*) to obtain an accurate
count.
This also is fastest way to see the row count on MySQL, because query like:
select count(*) from table;
Doing full table scan ...
where is gacutil.exe?
...s reserved.
Failure adding assembly to the cache: This assembly is built by a runtime newer than the currently loaded runtime and cannot be loaded.
In .NET 4.0 you'll need to search inside Microsoft SDK v8.0A, e.g.:
C:\Program Files (x86)\Microsoft SDKs\Windows\v8.0A\bin\NETFX 4.0 Tools
(in my ca...
SQLite Reset Primary Key Field
...
You can reset by update sequence after deleted rows in your-table
UPDATE SQLITE_SEQUENCE SET SEQ=0 WHERE NAME='table_name';
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imp...
HTTP GET Request in Node.js Express
.../ res.send('error: ' + err.message);
});
req.end();
};
It's called by creating an options object like:
const options = {
host: 'somesite.com',
port: 443,
path: '/some/path',
method: 'GET',
headers: {
'Content-Type': 'application/json'
}
};
And providing a callback function...
Rails 3 check if attribute changed
...
Check out ActiveModel::Dirty (available on all models by default). The documentation is really good, but it lets you do things such as:
@user.street1_changed? # => true/false
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...
How to create a bash script to check the SSH connection?
...ion uses keyboard password auth.
It is a variant of the solution proposed by GUESSWHOz.
nc -q 0 -w 1 "${remote_ip}" 22 < /dev/null &> /dev/null && echo "Port is reachable" || echo "Port is unreachable"
s...
In Postgresql, force unique on combination of two columns
...is case. From the PostgeSQL docs: "Note that a unique constraint does not, by itself, provide a unique identifier because it does not exclude null values.)" postgresql.org/docs/8.1/static/ddl-constraints.html#AEN2038
– ndequeker
Feb 3 '17 at 13:53
...
What's the difference between django OneToOneField and ForeignKey?
...article they will se only one author in the article.
For example: Article by John, Article by Harry, Article by Rick. You can not have Article by Harry & Rick because the boss does not want two or more authors to work on the same article.
How can we solve this 'problem' with the help of django...
How to set warning level in CMake?
...d_compile_options(...) if you want to apply it to all targets as suggested by @aldo in the comments.
Also, be sure to understand the difference between PRIVATE and PUBLIC (public options will be inherited by targets that depend on the given target).
...
Django self-referential foreign key
... imageUploader: {
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