大约有 3,551 项符合查询结果（耗时：0.0224秒） [XML]
Calculate distance between 2 GPS coordinates
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This is very easy to do with geography type in SQL Server 2008.
SELECT geography::Point(lat1, lon1, 4326).STDistance(geography::Point(lat2, lon2, 4326))
-- computes distance in meters using eliptical model, accurate to the mm
4326 is SRID for WGS84 elipsoidal Earth mod...
How to remove all MySQL tables from the command-line without DROP database permissions? [duplicate]
How do I drop all tables in Windows MySQL, using command prompt? The reason I want to do this is that our user has access to the database drops, but no access to re-creating the database itself, for this reason we must drop the tables manually. Is there a way to drop all the tables at once? Bear in ...
How do I find the MySQL my.cnf location
Is there a MySQL command to locate the my.cnf configuration file, similar to how PHP's phpinfo() locates its php.ini ?
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Get encoding of a file in Windows
... you're only looking for "bad encodings" from a known list of tools. (i.e. SQL Management Studio defaults to UTF16, which broke GIT auto-cr-lf for Windows, which was the default for many years.)
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Date format Mapping to JSON Jackson
....util.Date explicitly I want to point out that this does not work for java.sql.Date. See also my answer below.
– brass monkey
Nov 16 '18 at 16:00
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Is a LINQ statement faster than a 'foreach' loop?
...by the simpler to understand code.
With other LINQ providers like LINQ-to-SQL, then since the query can filter at the server it should be much better than a flat foreach, but most likely you wouldn't have done a blanket "select * from foo" anyway, so that isn't necessarily a fair comparison.
Re PL...
When to prefer JSON over XML?
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@sotn You haven't PL/SQL for JSON as have XML (e.g. XQuery). It's base for some NoSQL DB (eXist, MarkLogic Server, EMC Documentum xDB, BaseX, Zorba)
– Dmytro Melnychuk
Apr 23 '17 at 9:17
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Does a UNIQUE constraint automatically create an INDEX on the field(s)?
...ail, user_id) is enough, you don't need a separate index on email only - MySQL can use leftmost parts of a composite index. There may be some border cases where the size of an index can slow down your queries, but you should not worry about them until you actually run into them.
As for testing inde...
MySql : Grant read only options?
...nts, and change it around to create a new user with similar privileges:
mysql> SHOW GRANTS FOR 'not_leet'@'localhost';
+------------------------------------------------------------------------------------------------------------------------------------+
| Grants for not_leet@localhost ...
Number of days between two dates in Joda-Time
...er compliant with JDBC 4.2 or later. No need for strings, no need for java.sql.* classes.
Where to obtain the java.time classes?
Java SE 8, Java SE 9, Java SE 10, and later
Built-in.
Part of the standard Java API with a bundled implementation.
Java 9 adds some minor features and fixes.
Java ...