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.
Different types of JOINs. ( 1 INNER) JOIN: Select records that have matching values in both tables. 2  LEFT (OUTER) JOIN: Select records from the first (left-most) table with matching right table records. 3  RIGHT (OUTER) JOIN: Select records from the second (right-most) table with matching left table records.