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Additional info for Data and Databases. Concepts in Practice
It is different from the other seven because it is not a primitive operator, but can be defined in terms of the other operators. The idea is that given one table with columns (a,b), called the dividend, and a second table with column (a), called the divisor, we can get a result table with column (b), called the quotient. The values of (b) that we are seeking are those that have all the values of (a) in the divisor associated with them. To make this more concrete, if you have a table of pilots and the planes they are certified to fly called PilotSkills, and a table with the planes in our hangar, when you divide the PilotSkills table by the hangar table, you get the names of the pilots who can fly every plane in the hangar.
However, the entities are separate and might not match on other attributes, such as current market price or electrical conductivity. ” One entity can be transformed into the other in some well-defined manner. This is not quite the same as equality because some outside agency is needed for the transformation. In this case, you must add water to the concentrate. • Substitutability: “We don’t have beer. , beer and wine do not taste alike, but both are in the superclass of potables). Relational databases are built on the assumptions of identity or equality.
Break the table into three twocolumn tables, each of which uses a two-column constraint as its PRIMARY KEY, and insert some legal rows into each of them. CREATE TABLE period_teacher (period INTEGER NOT NULL, teacher CHAR (15) NOT NULL, PRIMARY KEY (period, teacher)); - 44 - INSERT INTO period_teacher VALUES _(1, 'Curly'), (1, 'Larry'), (1, 'Moe'), (2, 'Curly'), (2, 'Larry'), (3, 'Larry'), (3, 'Moe'); Now execute a query to join the three tables together, replacing the ptr constraint with a SELECT DISTINCT.
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