From invoices table, write a query to retrieve everything (all columns), plus, add an additional column that retrieves difference in the number of days between the invoice due date and payment date, and name the column “Difference”. Note that the difference in days should be calculated by subtracting “payment_date” from “invoice_due_date”. Hint1, refer to the following sample: ... Invoice Due Date Payment Date Difference ... 2018-05-08 2018-05-07 1 ... 2018-05-10 2018-05-14 -4 ... 2018-05-13 2018-05-09 4 Hint 2: simple subtraction or DATEDIFF function. Both work
SQL
SQL stands for Structured Query Language, is a form of communication that uses queries structured in a specific format to store, manage & retrieve data from a relational database.
Queries
A query is a type of computer programming language that is used to retrieve data from a database. Databases are useful in a variety of ways. They enable the retrieval of records or parts of records, as well as the performance of various calculations prior to displaying the results. A search query is one type of query that many people perform several times per day. A search query is executed every time you use a search engine to find something. When you press the Enter key, the keywords are sent to the search engine, where they are processed by an algorithm that retrieves related results from the search index. Your query's results are displayed on a search engine results page, or SER.
From invoices table, write a query to retrieve everything (all columns), plus, add an additional
date, and name the column “Difference”. Note that the difference in days should be calculated by
subtracting “payment_date” from “invoice_due_date”.
Hint1, refer to the following sample:
... Invoice Due Date Payment Date Difference
... 2018-05-08 2018-05-07 1
... 2018-05-10 2018-05-14 -4
... 2018-05-13 2018-05-09 4
Hint 2: simple subtraction or DATEDIFF function. Both works.
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