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What is DDL? Make a list of commands with short description used in DDL
Ans: Data Definition Language that is abbreviated as DDL is a computer language for defining data structures. The phrase was first introduced in relation to the Codasyl database model in which the schema of the database was written in a Data Definition Language explaining the records, fields, and "sets" making up the user Data Model.
List of DDL commands:
(a) To define a table/ relation
CREATE TABLE ------
(b) To eliminate table/relation definition
DROP TABLE ----
(iii) To alter the definition of an existing table
ALTER TABLE-------
Smart Alex Catering Sevice (SACS) is a company offering top class catering staff for prestigious events. The company employs approximately 200 hourly paid contact staff - chefs,
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What is horizontal fragmentation? Horizontal fragmentation divides the relation by assuming every tuple of r to one or more fragments
aggregation
UNION If R1 and R2 are two union compatible relations then R3 = R1 ∪ R2 is the relation having tuples that are either in R1 or in R2 or in both. In case, R3 will have tuples
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Create role named role_table that allows a user to create tables. Using role_table allow users kripa and reena to create tables. CREATE ROLE role_table; GRANT CREATE ANY TABLE
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