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PostgreSQL WHERE - Filter Data

Filter Records

TheWHERE clause is used to filter records.

It is used to extract only those records that fulfill a specified condition.

If we want to return only the records wherecity isLondon,we can specify that in theWHERE clause:

Example

SELECT * FROM customers
WHERE city = 'London';
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Text Fields vs. Numeric Fields

PostgreSQL requires quotes around text values.

However, numeric fields should not be enclosed in quotes:

Example

SELECT * FROM customers
WHERE customer_id = 19;
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Quotes around numeric fields will not fail, but it is good practice to always write numeric values without quotes.

Greater than

Use the> operator to return all records wherecustomer_id is greater than 80:

Example

SELECT * FROM customers
WHERE customer_id > 80;
Run Example »

Quotes around numeric fields will not fail, but it is good practice to always write numeric values without quotes.

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