IN SQL, POSTGRESQL. For customer, product and state, show the average sales before and after each quarter (e.g., for Q2, show average sales of Q1 and Q3. For “before” Q1 and “after” Q4, display . The “YEAR” attribute is not considered for this query – for example, both Q1 of 2017 and Q1 of 2018 are considered Q1 regardless of the year. Report #2: CUSTOMER PRODUCT STATE Q1 BEFORE_AVG AFTER_AVG ======== ======= =====   == ==========   ========= Bloom Bread NJ 1 2434 Sam Milk CT 3 254 325

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A: In this answer I will be providing the SQL query.

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A:

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Intermediate SQL Concepts

A query is a request for data or information from one or more database tables. This information could be presented in the form of pictorials, graphs, or complicated findings which helps in easy interpretation. Structured Query Language (SQL) is the most widely used programming language for retrieving and organizing data from relational databases. Collection of tables with rows and columns is referred to as a database. SQL is the language of databases. It makes it easier to extract specific data from databases, which can then be used for analysis.