大约有 40,000 项符合查询结果（耗时：0.0314秒） [XML]
What do column flags mean in MySQL Workbench?
In MySQL Workbench table editor there are 7 column flags available: PK, NN, UQ, BIN, UN, ZF, AI.
3 Answers
...
How to vertically align elements in ?
...n, you're not worrying about IE or older browsers.
So you can use display:table-cell and display:table-row like so:
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.or...
Why use 'virtual' for class properties in Entity Framework model definitions?
... nullable Foreign Key in SQL. You do not HAVE to eagerly join every keyed table when performing a query, but when you need the information -- it becomes demand-driven.
I also mentioned nullable because many navigation properties are not relevant at first. i.e. In a customer / Orders scenario, y...
Execute Insert command and return inserted Id in Sql
I am inserting some values into a SQL table using C# in MVC 4. Actually, I want to insert values and return the 'ID' of last inserted record. I use the following code.
...
MySQL SELECT WHERE datetime matches day (and not necessarily time)
I have a table which contains a datetime column. I wish to return all records of a given day regardless of the time. Or in other words, if my table only contained the following 4 records, then only the 2nd and 3rd would be returned if I limit to 2012-12-25.
...
How to include “zero” / “0” results in COUNT aggregate?
...u want an outer join for this (and you need to use person as the "driving" table)
SELECT person.person_id, COUNT(appointment.person_id) AS "number_of_appointments"
FROM person
LEFT JOIN appointment ON person.person_id = appointment.person_id
GROUP BY person.person_id;
The reason why this is wo...
switch case statement error: case expressions must be constant expression
...lookup involved (first on the internal SparseArray and later on the switch table)
That said, this enum can also be utilised to fetch the items in a fluent manner, if needed by keeping a reference to the id... but that's a story for some other time.
...
Hibernate show real SQL [duplicate]
...ent to your database.
this_ is an alias for that instance of the employee table.
share
|
improve this answer
|
follow
|
...
Why isn't `int pow(int base, int exponent)` in the standard C++ libraries?
...-correct-and-optimal implementation of integer pow is simply a tiny lookup table. :-)
– R.. GitHub STOP HELPING ICE
Dec 16 '13 at 9:00
...
JavaScript variable number of arguments to function
...
+1 This is elegant and clean solution. Especially suitable for passing through long list of parameters into another function call, and with possible that those variable parameters are at arbitrary position.
– haxpor
Sep 6 '17 at 7:55
...