大约有 9,000 项符合查询结果（耗时：0.0293秒） [XML]
How to group time by hour or by 10 minutes
...uncated at the level you specify.
'2000' is an "anchor date" around which SQL will perform the date math. Jereonh discovered below that you encounter an integer overflow with the previous anchor (0) when you group recent dates by seconds or milliseconds.†
SELECT DATEADD(MINUTE, DATEDIFF(MIN...
Efficiently updating database using SQLAlchemy ORM
...m starting a new application and looking at using an ORM -- in particular, SQLAlchemy.
6 Answers
...
Tools for Generating Mock Data? [closed]
...le (for "Populate database" option). Moreover going for one of the demos (hsqldb) with maven results in errors as well. To me it seems like the tool not in a good shape, thus not worth loosing the time with it.
– Peter Butkovic
Nov 7 '13 at 9:11
...
How to use count and group by at the same select statement
I have an sql select query that has a group by.
I want to count all the records after the group by statement.
Is there a way for this directly from sql?
For example, having a table with users I want to select the different towns and the total number of users
...
Problem with converting int to string in Linq to entities
...
With EF v4 you can use SqlFunctions.StringConvert. There is no overload for int so you need to cast to a double or a decimal. Your code ends up looking like this:
var items = from c in contacts
select new ListItem
{
...
How to get the next auto-increment id in mysql
How to get the next id in mysql to insert it in the table
19 Answers
19
...
Assign null to a SqlParameter
...e ?: requirement.
You can use the ?? null-coalescing operator as follows
SqlParameter[] parameters = new SqlParameter[1];
SqlParameter planIndexParameter = new SqlParameter("@AgeIndex", SqlDbType.Int);
planIndexParameter.Value = (object)AgeItem.AgeIndex ?? DBNull.Value;
parameters[0] = planIn...
Drop all tables whose names begin with a certain string
...
In SQL Server 2005 I had to change the last two lines to close cmds; deallocate cmds.
– Hamish Grubijan
Apr 26 '11 at 14:08
...
What is the difference between a schema and a table and a database?
...ion of tables. A DBMS (Database Management System) is the software (like MySQL, SQL Server, Oracle, etc) that manages and runs a database.
share
|
improve this answer
|
follo...
XMLHttpRequest Origin null is not allowed Access-Control-Allow-Origin for file:/// to file:/// (Serv
...eeded in a separate javascript file instead. (In my case I needed a binary SQLite blob to use with https://github.com/kripken/sql.js/)
I created a file called base64_data.js (and used btoa() to convert the data that I needed and insert it into a <div> so I could copy it).
var base64_data = "...