Further, they point out that these pop-up businesses are powered by whatâs becoming known as âgig workersâ â a term borrowed from the music industry, where musicians move from job to job (gig to gig), employed for a particular performance or a defined time, with little more connection to the venue than to the fast food theyâre eating for lunch.
Answer: B. Multiple-row subqueries return more than one row of results.Operators that can be used with multiple-row subqueries include IN, ALL, ANY, and EXISTS.The multi row operators IN, ANY, ALL must be used with single row operators as shown in the option B.
1. Basically have a subquery in the FROM clause with alias a. Subqueries in the FROM Clause (MySQL). 2. Later we use the UNION operator, per MySQL site says:  UNION is used to combine the result from multiple SELECT statements into a single result set. .http://dev.mysql.com/doc/refman/5.0/en/union.html.Reference: Sql Select from List.. Later we use the UNION operator, per MySQL site says:  UNION is used to combine the result from multiple SELECT statements into a single result set. . http://dev.mysql.com/doc/refman/5.0/en/union.html. Reference: Sql Select from List.