2015年3月23日 · In ng-options use ng-options="property.data.Bedrooms as instead of ng-options="property.data.SubType as because data.Bedrooms is the property that contains …

If col1 is unique, and col2 is unique, then col1+col2 is also unique, so there would be no need for a composite key or constraint. – SteveW Commented Oct 5, 2023 at 19:14

2010年5月7日 · Based on Google's recommendations, I implemented a class that will generate a unique UUID for each device, using ANDROID_ID as the seed where appropriate, falling back …

The UNIQUE constraint does exactly what you want. NULL values can coexist in multiple rows in a column defined UNIQUE. The manual: In general, a unique constraint is violated when there …

2015年11月15日 · Here is an extension method for setting unique indexes more fluently: public static class MappingExtensions { public static PrimitivePropertyConfiguration IsUnique(this …

jQuery.unique lets you get unique elements of an array, but the docs say the function is mostly for internal use and only operates on DOM elements. Another SO response said the unique() …

I have to design and implement a reservation system for a hotel. I have an array list of Reservation objects an array list of room objects I want to 'reserve' the room at a given date.

Create all possible unique values that can be created from product_id and branch_id by creating a string separated by a character, in this case -Generate unique random values from this set …

2012年3月5日 · Unique Key (UK): It's a column or a group of columns that can identify a uniqueness in a row. Primary Key (PK): It's also a column or group of columns that can identify …

2013年3月18日 · The constraint could be removed with syntax: ALTER TABLE. As of MySQL 8.0.19, ALTER TABLE permits more general (and SQL standard) syntax for dropping and …