大约有 3,568 项符合查询结果（耗时：0.0187秒） [XML]
SQL JOIN - WHERE clause vs. ON clause
After reading it, this is not a duplicate of Explicit vs Implicit SQL Joins .
The answer may be related (or even the same) but the question is different.
...
1052: Column 'id' in field list is ambiguous
...
SQL supports qualifying a column by prefixing the reference with either the full table name:
SELECT tbl_names.id, tbl_section.id, name, section
FROM tbl_names
JOIN tbl_section ON tbl_section.id = tbl_names.id
...or a ta...
SQL Add foreign key to existing column
If I am using the following SQL command in SQL Server 2008 to update a table with a foreign key constraint:
6 Answers
...
Best way to work with transactions in MS SQL Server Management Studio
Let's say I have an SQL statement that's syntactically and semantically correct so it executes.
2 Answers
...
Why all the Active Record hate? [closed]
...
end
people = Person.find(:all, :include => :company )
This generates SQL with LEFT JOIN companies on companies.id = person.company_id, and automatically generates associated Company objects so you can do people.first.company and it doesn't need to hit the database because the data is already p...
Using IQueryable with Linq
...t;= 25.00);
The code looks the same, but the difference here is that the SQL executed will be SELECT * FROM Products WHERE Cost >= 25.
From your POV as a developer, this looks the same. However, from a performance standpoint, you may only return 2 records across the network instead of 20,000....
What exactly is Arel in Rails 3.0?
...ement for ActiveRecord
No, it isn't. It's a replacement for hand-crafting SQL queries in strings. It is a common query layer that underlies ActiveRecord, but it can also be used as an underpinning for DataMapper, for example.
If it is a replacement for anything, it's a replacement for Ambition. Or,...
How to rename a table in SQL Server?
The SQL query that I have used is :
8 Answers
8
...
SQL-Server: The backup set holds a backup of a database other than the existing
I am trying to restore a SQL Server backup file for my database, but it is throwing an error as follow:
24 Answers
...
SQL Server Management Studio won't let me add an index to a table
...ble just in case, and refreshed and restarted SSMS, but no luck. I'm using SQL Server 2012 Business Intelligence SP1 CTP.
5...