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Operators on Tables and Rows
Row Extraction
TUPLE FROM r, SQL has row subqueries. These are just like scalar subqueries except that they may specify more than one column. For example, when appearing in a suitable context, the expression
(SELECT * FROM COURSE WHERE CourseId = CID ('C1'))
Yields the row denoted by
CAST (ROW ('C1', 'Database') AS
ROW (CourseId CID, Title VARCHAR (100)))
A row subquery whose table operand is empty yields a row in which every field is NULL.
Field Extraction: For extracting a field from a row, using dot qualification.
I need a query for PL/SQL, selecting names with cursor, goes down the list, assigns usernames (initials001) based on initials in the name. If two names have same initials the user
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Use of Table Expressions - Expressing Constraint Conditions With the exception of key constraints, the examples in the theory book all explicitly reference at least one relvar
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