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What are primary keys and foreign keys?
Primary keys are the unique identifiers for every row. They must have unique values and cannot be null. Due to their significance in relational databases, Primary keys are the most fundamental of all keys and constraints. A table can have only one Primary key. Foreign keys are both a method of ensuring data integrity and a manifestation of the relationship among tables.
What is metadata? Metadata is data that explains another data. Class definition is metadata. Models are inherently metadata as they explain the things being modeled.
mechanics of structured analysis
Q. Define Master Construct in FORTAN? The master directive has following general form: #pragma omp master structured_block It causes master thread to execute structu
Security features used in Client-Server types of network are as follows : i) Digital Signatures ii) Encryption / Decryption iii) Secure Socket Layer (SSL) iv) Firewa
The process which is underlined throughout the check of base data is called as candidate check. When performing candidate check performance varies either towards the positive side
What is the difference between a subscript and an index in a table definition? Ans) A subscript is a working storage data definition item, typically a PIC (999) where a value mu
Levels Of Parallel Processing Depending upon the difficulty under consideration, parallelism in the answer of the problem may be achieved at dissimilar levels and in different
Q. Show Encoding data options? PVM uses SUN's XDR library to make a machine independent data format if you request it. Settings for encoding option are: PvmDataDefault: Use
Determine the function of Dynamic model Dynamic model: Dynamic model describes how system responds to external events. The implementation of the control flow in a program must
What is disadvantage of Distributed systems? Ans. Reliability is disadvantage of Distributed system.
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