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What is transaction?
Transaction is a unit of program implementation that accesses and possibly updated several data items.
WOUND-WAIT
what is Mapping Constraints? with examples
Partial Key : It is a group of attributes that can uniquely identify small entities and that are related to same base entity. It is sometime named as Discriminator. Altern
What Count function return in SQL? Count function within SQL returns the number of values. (Count function counts all the not null values in the exact column. If we need to cou
Although, the essential features of E-R diagrams are enough to design many database situations. Though, with more difficult relations and advanced database applications, it is need
what is physical data structure
Multiple column Queries: Syntax: SELECT COLUMN1, COL2,...... FROM TABLE WHERE (COLUMN1, COL2, ...) IN (SELECT COLUMN1, COL2,.... FROM TABLE WHERE );
What is the aim of object design The aim of object design is to identify object which the system contains and the interactions among them. The system implements specification
In case of entity integrity, the primary key may be declared? In a case of entity integrity primary key may be not Null.
Whenever the LIMIT clause will be used? LIMIT is used for the following kinds of problems: 1) Answering questions about first or last and largest or smallest 2) Splitting
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