In the ideal gas law equation, what does the variable n stands for B. moles of gas. (n: a lowercase ânâ stands for the number of moles of a gas. [ This is a measurement in moles, so if you are given a mass in grams or kilograms, be sure to change it to moles first.) ]. Expert answered| cecillereign |Points 261|.
Theta-Join I The theta-join of two relations R and S is the set of tuples in theCartesian product of R and S that satisfy some condition C.RA R ./ C SSQL SELECT *FROM R, SWHERE C; I R ./ C S = Ë C (R S): T. M. Murali August 30, 2010 CS4604: SQL and Relational Algebra. Results of operations are also sets of tuples. (Later, we will dene arelational algebra on bags.) I Think of expressions in relational algebra as queries, which construct newrelations from given relations. I Four types of operators: I Remove parts of a single relation: projection and selection.
To put it simply, the Join makes relational database systems relational. Joins allow you to link data from two or more tables together into a single query result--from one single SELECT statement. A Join can be recognized in a SQL SELECT statement if it has more than one table after the FROM keyword.For example: Joins can be explained easier by demonstrating what would happen if you worked with one table only, and didn't have the ability to use joins. Join can be recognized in a SQL SELECT statement if it has more than one table after the FROM keyword. For example: Joins can be explained easier by demonstrating what would happen if you worked with one table only, and didn't have the ability to use joins.