The United Nations Convention on the Protection of the Rights of All Migrant Workers and Members of Their Families defines migrant worker as follows: The term migrant worker refers to a person who is engaged or has been engaged in a remunerated activity in a State of which he or she is not a national.
A mathematical expression can be as simple as 2 + 4 or as complex as -4xy + 8 x - 5(x/y). All mathematical expressions contain terms and each term has a coefficient, the numerical factor.
SQL - Expressions. An expression is a combination of one or more values, operators, and SQL functions that evaluate to a value. SQL EXPRESSIONs are like formulas and they are written in query language. You can also use them to query the database for specific set of data.