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SQL.BuildAndDestroy/README.md

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+# Build and Destroy: Introductory SQL Queries
+
+Given the scenarios, add the the directed queries to the "answers" directory's files.
+
+## Creating databases
+
+Write the correct SQL statement to create a new database called **myNewDB**.
+
+*(Add your query to the file exercise1.sql)*
+
+## Deleting databases
+
+Write the correct SQL statement to delete a database named **myNewDB**.
+
+*(Add your query to the file exercise2.sql)*
+
+## Creating tables
+
+Write the correct SQL statement to create a new table called **Users**, with an int field called **UserID**, and the following varchar fields of size 255: **LastName, FirstName, Address, City**
+
+*(Add your query to the file exercise3.sql)*
+
+## Deleting tables
+
+Write the correct SQL statement to delete a table called **Users**.
+
+*(Add your query to the file exercise4.sql)*
+
+
+Use the **TRUNCATE** statement to delete all data inside the **Users** table.
+
+*(Add your query to the file exercise5.sql)*
+
+## Altering tables
+
+Add a column of type **DATE** called **Birthday** to the **Users** table.
+
+*(Add your query to the file exercise6.sql)*
+
+Delete the column **Birthday** from the **Users** table.
+
+*(Add your query to the file exercise7.sql)*
+
+
+## Inserting records
+
+Insert a new record in the **Students** table.
+
+**Schema:**
+
+```
+StudentName,
+Address, 
+City, 
+PostalCode,
+Country
+```
+
+**Record's info to enter:**
+
+```
+Jane Doe
+57 Union St
+Glasgow, Scotland
+G13RB
+```
+
+*(Add your query to the file exercise8.sql)*
+
+## Selecting Records
+
+### Where
+
+Use the **NOT** keyword to select all records in the **Students** table where **City** is NOT "Philadelphia".
+
+*(Add your query to the file exercise9.sql)*
+
+Select all records in the **Students** table where the **City** column has the value 'Philadelphia' or 'Trenton'.
+
+*(Add your query to the file exercise10.sql)*
+
+### Order By
+Select all records from the **Students** table, sort the result alphabetically by the column **City**.
+
+*(Add your query to the file exercise11.sql)*
+
+Select all records from the **Students** table, sort the result reversed alphabetically by the column **City**.
+
+*(Add your query to the file exercise12.sql)*
+
+Select all records from the **Students** table, sort the result alphabetically, first by the column **Country**, then by the column **City**.
+
+*(Add your query to the file exercise13.sql)*
+
+### Null values
+Select all records from the **Students** where the **PostalCode** column is empty.
+
+*(Add your query to the file exercise14.sql)*
+
+Select all records from the **Students** where the **PostalCode** column is **NOT** empty.
+
+*(Add your query to the file exercise15.sql)*
+
+
+## Updating records
+Update the **City** column of all records in the **Students** table and set it to "Edinburgh".
+
+*(Add your query to the file exercise16.sql)*
+
+ Set the value of the **City** columns to "Edinburgh", but only the ones where the **Country** column has the value "Scotland".
+
+*(Add your query to the file exercise17.sql)*
+
+Update the **City** value and the **Country** value to "Edinburgh", "Scotland" in the **Students** table, for the Student whose ID is 35.
+
+*(Add your query to the file exercise18.sql)*
+
+## Deleting Records
+Delete all the records from the **Students** table where the **Country** value is "Scotland".
+
+*(Add your query to the file exercise19.sql)*
+
+Delete all the records from the **Students** table.
+
+*(Add your query to the file exercise20.sql)*

SQL.BuildAndDestroy/answers/exercise1.sql

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+CREATE DATABASE myNewDB;

SQL.BuildAndDestroy/answers/exercise10.sql

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+SELECT * FROM Students WHERE City IN ('Trenton', 'Philadelphia');

SQL.BuildAndDestroy/answers/exercise11.sql

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+SELECT * FROM Students ORDER BY City;

SQL.BuildAndDestroy/answers/exercise12.sql

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+SELECT * FROM Students ORDER BY City DESC;

SQL.BuildAndDestroy/answers/exercise13.sql

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+SELECT * FROM Students ORDER BY Country , City;

SQL.BuildAndDestroy/answers/exercise14.sql

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+INSERT INTO Students(
+StudentName,
+Address,
+City, 
+Country,
+PostalCode)
+VALUES(
+'Steve-o',
+'57 Union St',
+'Glasgow',
+'Scotland',
+NULL);
+
+SELECT * FROM Students WHERE PostalCode IS NULL;

SQL.BuildAndDestroy/answers/exercise15.sql

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+SELECT * FROM Students WHERE PostalCode IS NOT NULL;

SQL.BuildAndDestroy/answers/exercise16.sql

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+UPDATE Students SET City = 'Edinburgh';
+SET SQL_SAFE_UPDATES = 0;

SQL.BuildAndDestroy/answers/exercise17.sql

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+UPDATE Students SET City = 'Edinburgh' WHERE Country = 'Scotland';

SQL.BuildAndDestroy/answers/exercise18.sql

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+UPDATE Students SET City = 'Edinburgh' AND Country = 'Scotland' WHERE ID =35;

SQL.BuildAndDestroy/answers/exercise19.sql

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+DELETE FROM Students WHERE Country = 'Scotland';

SQL.BuildAndDestroy/answers/exercise2.sql

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+DROP DATABASE myNewDB;

SQL.BuildAndDestroy/answers/exercise20.sql

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+Delete FROM Students;

SQL.BuildAndDestroy/answers/exercise3.sql

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+USE myNewDB;
+CREATE TABLE Users(
+UserID int, LastName VARCHAR(255), 
+FirstName VARCHAR(255), Address VARCHAR(255), 
+City VARCHAR(255));
+DESCRIBE Users;

SQL.BuildAndDestroy/answers/exercise4.sql

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+DROP TABLE Users;

SQL.BuildAndDestroy/answers/exercise5.sql

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+TRUNCATE TABLE Users;

SQL.BuildAndDestroy/answers/exercise6.sql

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+ALTER TABLE Users 
+ADD Birthday DATE;
+DESCRIBE Users;

SQL.BuildAndDestroy/answers/exercise7.sql

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+ALTER TABLE Users
+DROP Birthday;
+DESCRIBE Users;

SQL.BuildAndDestroy/answers/exercise8.sql

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+CREATE TABLE Students( 
+StudentName VARCHAR(255),
+Address VARCHAR(255), 
+City VARCHAR(255), 
+PostalCode VARCHAR(255),
+Country VARCHAR(255));
+
+
+INSERT INTO Students(
+StudentName,
+Address,
+City, 
+Country,
+PostalCode)
+VALUES(
+'Jane Doe',
+'57 Union St',
+'Glasgow',
+'Scotland',
+'G13RB');
+
+SELECT * FROM Students;

SQL.BuildAndDestroy/answers/exercise9.sql

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+SELECT * FROM Students WHERE City NOT IN ('Philadelphia');