大约有 40,000 项符合查询结果（耗时：0.0392秒） [XML]
How to get first record in each group using Linq
...roup element by element.F1
into groups
select groups.OrderBy(p => p.F2).First();
share
|
improve this answer
|
follow
|...
SQL Server - SELECT FROM stored procedure
...le result sets, each with its own schema. It's not suitable for using in a SELECT statement.
share
|
improve this answer
|
follow
|
...
Querying data by joining two tables in two database on different servers
...just prefixing the database name with the other server. I.E:
-- FROM DB1
SELECT *
FROM [MyDatabaseOnDB1].[dbo].[MyTable] tab1
INNER JOIN [DB2].[MyDatabaseOnDB2].[dbo].[MyOtherTable] tab2
ON tab1.ID = tab2.ID
Once the link is established, you can also use OPENQUERY to execute a SQL st...
Import .bak file to a database in SQL server
...t only accept a restore from that point? I find it very odd that I can not select a backup file to restore.
– James
Nov 21 '16 at 18:49
13
...
How do I change db schema to dbo
...which will generate a set of ALTER sCHEMA statements for all your talbes:
SELECT 'ALTER SCHEMA dbo TRANSFER ' + TABLE_SCHEMA + '.' + TABLE_NAME
FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA = 'jonathan'
You then have to copy and run the statements in query analyzer.
Here's an older script t...
A generic list of anonymous class
... okay cool, now we need an example of replacing the new {} lines with a select statement. var list = sourceList.Select( o => new { o.ModelId, ...
Selecting with complex criteria from pandas.DataFrame
...se pandas it has some built in functions for comparison. So if you want to select values of "A" that are met by the conditions of "B" and "C" (assuming you want back a DataFrame pandas object)
df[['A']][df.B.gt(50) & df.C.ne(900)]
df[['A']] will give you back column A in DataFrame format.
pan...
Open file dialog and select a file using WPF controls and C#
...y files to search only for image files (type jpg, png, bmp...).
And when I select an image file and click Ok in the file dialog I want the file directory to be written in the textbox1.text like this:
...
Want to find records with no associated records in Rails
... get everyone with no friends in the first case:
Person.where('id NOT IN (SELECT DISTINCT(person_id) FROM friends)')
share
|
improve this answer
|
follow
|
...
How to get the max of two values in MySQL?
...
Use GREATEST()
E.g.:
SELECT GREATEST(2,1);
Note: Whenever if any single value contains null at that time this function always returns null (Thanks to user @sanghavi7)
s...