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How do you manage databases in development, test, and production?
...readable also at http://martinfowler.com/articles/evodb.html
In one PHP+MySQL project I've had the database revision number stored in the database, and when the program connects to the database, it will first check the revision. If the program requires a different revision, it will open a page for ...
How to split a comma-separated value to columns
...does not even solve the issue There are much better approaches around! For SQL-Server 2016+ look for STRING_SPLIT() (which does not carry the fragment's position, a huge fail!) or the really fast JSON-hack. For older version look for the well-known XML-hack (json and xml details here). Or look for o...
Like Operator in Entity Framework?
...sing EF 6.2.x. To this answer if you're using EF Core 2.x
Short version:
SqlFunctions.PatIndex method - returns the starting position of the first occurrence of a pattern in a specified expression, or zeros if the pattern is not found, on all valid text and character data types
Namespace: System...
Get size of all tables in database
I have inherited a fairly large SQL Server database. It seems to take up more space than I would expect, given the data it contains.
...
Multiline strings in VB.NET
...
Multi-line strings are available since the Visual Studio 2015.
Dim sql As String = "
SELECT ID, Description
FROM inventory
ORDER BY DateAdded
"
You can combine them with string interpolation to maximize usefullness:
Dim primaryKey As String = "ID"
Dim inventoryTable As String = ...
Hibernate Criteria returns children multiple times with FetchType.EAGER
...he OrderTransaction, it has to return the same amount of results a regular sql join will return
So actually it should apear multiple times. this is explained very well by the author (Gavin King) himself here:
It both explains why, and how to still get distinct results
Also mentioned in the Hiber...
Oracle 11.2.0.4 RAC FOR redhat 6.4 - 数据库(内核) - 清泛网 - 专注C/C++及内核技术
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数据库创建完成。
验证服务
[oracle@dmjyrac1 ~]$ sqlplus /nolog
SQL> conn / as sysdba
SQL> startup
查看数据库状态
SQL> select open_mode from v$database;
OPEN_MODE
--------------------
READ WRITE
查看数据库字符集
SQL> select userenv('language') ...
List of all index & index columns in SQL Server DB
How do I get a list of all index & index columns in SQL Server 2005+? The closest I could get is:
30 Answers
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Difference between clustered and nonclustered index [duplicate]
...- INT or BIGINT as your default option.
By default, the primary key on a SQL Server table is also used as the clustering key - but that doesn't need to be that way!
One rule of thumb I would apply is this: any "regular" table (one that you use to store data in, that is a lookup table etc.) shoul...
How to strip all non-alphabetic characters from string in SQL Server?
...
I knew that SQL was bad at string manipulation, but I didn't think it would be this difficult. Here's a simple function to strip out all the numbers from a string. There would be better ways to do this, but this is a start.
CREATE FUNCT...