Added template files

How-to-code-subqueries.sql

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+-- Exercise 1
+
+
+-- Exercise 2
+
+
+-- Exercise 3
+
+
+-- Exercise 4
+
+
+-- Exercise 4 Part 2
+
+
+-- Exercise 5
+
+
+-- Exercise 6

How-to-code-summary-queries.sql

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+-- Exercise 1
+
+
+-- Exercise 2
+
+
+-- Exercise 3
+
+
+-- Exercise 4
+
+
+-- Exercise 5
+
+
+-- Exercise 6
+
+
+-- Exercise 7

How-to-insert-update-and-delete-data.sql

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+-- Exercise 1
+
+
+-- Exercise 2
+
+
+-- Exercise 3
+
+
+-- Exercise 4
+
+
+-- Exercise 5
+
+
+-- Exercise 6
+
+
+-- Exercise 7
+
+
+-- Exercise 8
+
+
+-- Exercise 9
+
+
+-- Exercise 10
+
+

How-to-retrieve-data-from-a-single-table.sql

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+-- Exercise 1
+
+
+-- Exercise 2
+
+
+-- Exercise 3
+
+
+-- Exercise 4
+
+
+-- Exercise 5
+
+
+-- Exercise 6
+
+
+-- Exercise 7
+
+
+-- Exercise 8

How-to-retrieve-data-from-two-or-more-tables.sql

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+-- Exercise 1
+
+
+-- Exercise 2
+
+
+-- Exercise 3
+
+
+-- Exercise 4
+
+
+-- Exercise 5
+
+
+-- Exercise 6
+
+
+-- Exercise 7