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A field-groups statement or an insert statement reverses storage space and transfers values. False.
Q. Explain the terms key constraints participation constraints and mapping caradinalities in ER model. Participation Constraints : The participation of an entity set E i
What are the various symbols used to draw an E-R diagram? Explain with the help of an example how weak entity sets are represented in an E-R diagram. Various symbols used to d
Explain Relational model and their use in DBMS? Relational Model - The relational model was first introduced through E.F. Codd of the IBM Research in the year of 1970. The mode
Concatenation operator Example : Printing name and job as one string as column name employees: SELECT ENAME||JOB "EMPLOYEES" FROM EMP;
Explain Two phase locking protocol A transaction is consider as to follow the two-phase locking protocol if all locking operations precede the first unlock operation in the tra
Relationship between Security and Integrity: Database security usually refers to access, while database integrity refers to avoidance of accidental loss of consistency. But usually
1. Which model is used to store data in tree structures Ans: Hierarchical model is used to store data in tree structures
In E-R Diagram how relationship type is represented ? In E-R Diagram relationship type is represented as a Diamond.
What is known as a search key? An attribute or set of attributes used to look up records in a file is known as a search key.
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