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MySQL check if a table exists without throwing an exception
What is the best way to check if a table exists in MySQL (preferably via PDO in PHP) without throwing an exception. I do not feel like parsing the results of "SHOW TABLES LIKE" et cetera. There must be some sort of boolean query?
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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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linux下iptables配置详解 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...337 -j DROP
有些些特洛伊木马会扫描端口31337到31340(即黑客语言中的 elite 端口)上的服务。既然合法服务都不使用这些非标准端口来通信,阻塞这些端口能够有效地减少你的网络上可能被感染的机器和它们的远程主服务器进行独立通...
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 ...
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...
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
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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...
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...
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
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