System R was designed and developed over a period of 1974-79 at IBM San Jose Research Center. It is a prototype and its purpose was to demonstrate that it is possible to build a Relational System that can be used in a real life environment to solve real life problems, with performance at least comparable to that of existing system.
Its two subsystems are
► Research Storage
► System Relational Data System.
What is the difference between Truncate and Delete interms of Referential Integrity?
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What is referential integrity constraint?
What is difference between CHAR and VARCHAR2? What is the maximum SIZE allowed for each type?
What is SQL ROWID?
Explain CONNECT BY PRIOR?
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For which trigger timing can you reference the NEW and OLD qualifiers?
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