enum approaches look pretty much the same for a human eye. On the other hand, the integer is not human-readable. Then you see status=1, you have no way to say what status is just by looking into the database, and you have to keep the mapping between numbers and words in your code...
(MySQL) .NET pdf viewer .pdb files in production environment? 'An operation was attempted on a nonexistent network connection' error 'bootstrap' is not a valid script name. The name must end in '.js'. 'Cannot implicitly convert 'System.TimeSpan' to 'System.DateTime' 'DayOfWeek' is not...
What are ENUMs used for in MySQL? Using Enum can restrict the number of values that can be allowed to go inside a table. If there is an ENUM for Colors ENUM(‘blue’,’yellow’,’green’) I can use an insert statement like Insert colors values (‘red’). ...
How to do multiple radio button list using Enum in MVC3 and Return to View how to do not route images, css,js etc How to do the dependency injection from web.config file How to do validation on Html.CheckboxFor() control to decide value of other checkbox. How To Download a View in ...
This section describes 'enum' types, which are defined by 'enum' declaration statements. An 'enum' type is actually a special kind of class type.
The database object semantics between SQL Server and MySQL are similar, but not identical. There are architectural differences that must be considered when migrating from SQL Server to MySQL. In MySQL, there is no difference between a database anda schema, while SQL Server treats the two as se...
Interop.Enums Commands.StorageSync.Interop.Exceptions Commands.StorageSync.Interop.Interfaces Microsoft.Azure.Commands.ActiveDirectory Microsoft.Azure.Commands.Aks.Generated.Version2017_08_31 Microsoft.Azure.Commands.Aks.Generated.Version2017_08_31.Models Microsoft.Azure.Commands.Common...
color ENUM('red', 'blue', 'yellow', 'white', 'black') NOT NULL, owner SMALLINT UNSIGNED NOT NULL REFERENCES person ); In previous versions of MySQL, only the first of the statements just shown had the effect of creating a foreign key. ...
2 rows in set (0.00 sec) 集合并集语义:union all/union distinct 早先版本就有,没有mysql使用经验的读者可以了解下 mysql> select * from t1 union all select * from t3; +---+ | a | +---+ | 1 | | 2 | | 2 | | 2 | | 3 | ...
To create a tableshirthaving a foreign keyowneronperson, MySQL now accepts and handles correctly any of theCREATE TABLEstatements shown here according to the standard: CREATE TABLE shirt ( id SMALLINT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY, style ENUM('tee', 'polo', 'dress') NOT NULL...