大约有 9,000 项符合查询结果(耗时:0.0409秒) [XML]

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Adding a new SQL column with a default value

I am looking for the syntax to add a column to a MySQL database with a default value of 0 10 Answers ...
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Format of the initialization string does not conform to specification starting at index 0

...hich has a list of commonly used ones. Commonly used Connection Strings: SQL Server 2012 Standard Security Server=myServerAddress;Database=myDataBase;User Id=myUsername;Password=myPassword; Trusted Connection Server=myServerAddress;Database=myDataBase;Trusted_Connection=True; Connection to ...
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When to use a View instead of a Table?

... @ouonomos: A normal view doesn't contain any data. It is just a stored SQL statement, i.e. a view on the underlying data. Some databases (e.g. Oracle, PostgreSQL) support materialized views, which store the "view" temporarily in another table for faster access. This is done to speed up read acce...
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Set a DateTime database field to “Now”

In VB.net code, I create requests with SQL parameters. It I set a DateTime parameter to the value DateTime.Now, what will my request look like ? ...
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T-SQL: Selecting rows to delete via joins

... In PostgreSQL syntax with join doesn't work but it is possible to use "using" keyword. DELETE from TableA a using TableB b where b.Bid = a.Bid and [my filter condition] – bartolo-otrit Jun 13 '12...
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PostgreSQL: Show tables in PostgreSQL

What's the equivalent to show tables (from MySQL) in PostgreSQL? 24 Answers 24 ...
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How to delete large data of table in SQL without log?

...rform a checkpoint. This is how I would do it and take this article http://sqlperformance.com/2013/03/io-subsystem/chunk-deletes as reference, with performance tests and graphs: DECLARE @Deleted_Rows INT; SET @Deleted_Rows = 1; WHILE (@Deleted_Rows > 0) BEGIN BEGIN TRANSACTION -- Del...
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Learning about LINQ [closed]

...ject reference comparison Apply aggregates to empty collections in LINQ to SQL queries Delay loading a property in LINQ to SQL Use table-valued functions with eager loading turned on Put joins in the correct order in a LINQ to Objects query Compose a LINQ query inside a loop http://www.aspnetpro.c...
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List of tables, db schema, dump etc using the Python sqlite3 API

For some reason I can't find a way to get the equivalents of sqlite's interactive shell commands: 11 Answers ...
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SQL : BETWEEN vs =

In SQL Server 2000 and 2005: 11 Answers 11 ...