SQL Query to fetch data
To retrieve all records from a database table, you can use the SQL SELECT statement with the * wildcard character, like this:
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SELECT * FROM my_table;
Replace my_table with the name of the table you want to retrieve records from. This statement will return all records from the specified table.
You can also use the SELECT statement with specific columns to retrieve only certain columns of data from the table, like this:
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SELECT column1, column2, column3 FROM my_table;
This statement will return only the specified columns (column1, column2, and column3) from the my_table table.
Additionally, you can use various SQL clauses to filter, sort, group, and aggregate data in your queries. Some common clauses include:
WHERE: Used to filter records based on a condition. For example:
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SELECT * FROM my_table WHERE column1 = 'value';
ORDER BY: Used to sort records by one or more columns. For example:
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SELECT * FROM my_table ORDER BY column1 DESC;
GROUP BY: Used to group records by one or more columns. For example:
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SELECT column1, COUNT(*) FROM my_table GROUP BY column1;
JOIN: Used to combine data from multiple tables based on a common column. For example:
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SELECT * FROM table1 JOIN table2 ON table1.id = table2.table1_id;
These clauses can be combined to create more complex queries that retrieve and manipulate data in various ways.
