Note the techniques below associated with the rudiments of Structured Query Language (SQL), explain how you would apply at least three of the techniques to a medical records database.
The Structured Query Language (SQL) is a domain-specific language used for managing and manipulating relational databases. It’s essential for working with databases to store, retrieve, and manipulate data. Here are some of the rudiments of SQL:
SELECT Statement: The most common SQL statement, used to retrieve data from a database.
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SELECT column1, column2 FROM table_name WHERE condition;
INSERT Statement: Used to add new records into a table.
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INSERT INTO table_name (column1, column2) VALUES (value1, value2);
UPDATE Statement: Used to modify existing records in a table.
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UPDATE table_name SET column1 = value1, column2 = value2 WHERE condition;
DELETE Statement: Used to remove records from a table.
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DELETE FROM table_name WHERE condition;
CREATE TABLE Statement: Used to define a new table and its columns.
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CREATE TABLE table_name ( column1 datatype, column2 datatype, … );
ALTER TABLE Statement: Used to modify an existing table structure.
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ALTER TABLE table_name ADD column_name datatype;
DROP TABLE Statement: Used to delete an existing table.
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DROP TABLE table_name;
SELECT DISTINCT: Used to retrieve unique values from a column.
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SELECT DISTINCT column_name FROM table_name;
ORDER BY Clause: Used to sort the result set in ascending or descending order.
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SELECT column1, column2 FROM table_name ORDER BY column1 ASC, column2 DESC;
WHERE Clause: Used to filter records based on specified conditions.
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SELECT column1, column2 FROM table_name WHERE condition;
JOIN Clause: Used to combine rows from two or more tables based on a related column.
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SELECT column1, column2 FROM table1 JOIN table2 ON table1.column = table2.column;
GROUP BY Clause: Used to group rows that have the same values in specified columns.
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SELECT column1, COUNT(*) FROM table_name GROUP BY column1;
HAVING Clause: Used with GROUP BY to filter the result set based on aggregated values.
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SELECT column1, COUNT(*) FROM table_name GROUP BY column1 HAVING COUNT(*) > 5;
These are just some of the fundamental SQL concepts and statements. SQL is a powerful language that allows you to perform complex data manipulation and retrieval operations on databases.
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