Create a Postgres Table

Insert Data into Postgres Tables

Filter Data in a Postgres Table with Query Statements

Update Data in Postgres

Delete Postgres Records

Group and Aggregate Data in Postgres

Sort Postgres Tables

Ensure Uniqueness in Postgres

Use Foreign Keys to Ensure Data Integrity in Postgres

Create Foreign Keys Across Multiple Fields in Postgres

Enforce Custom Logic with Check Constraints in Postgres

Speed Up Postgres Queries with Indexes

Find Intersecting Data with Postgres’ Inner Join

Select Distinct Data in Postgres

Get Started With PostgreSQL

How many users visited our site yesterday? We can find out by looking at each visit, and limiting this list to a distinct list of users (who may have visited many times). In this lesson we’ll learn how to answer questions like these with the distinct keyword.

[00:01] We'll look at getting distinct information, today. Create a movies' table. We'll insert a couple of titles here. "American History X" gets inserted twice.

[00:12] Maybe, that's OK. Maybe, you can have multiple American History Xs as long as they have different dates. If we select all of this right now, we'll see that we have two American History Xs listed in here.

[00:27] What do we do, though, if we want to get distinct titles? We just select distinct titles. Now, we have different titles, probably still want to make sure that they are in order.

[00:41] We can also do other things, like we can count the number of distinct titles. This is something that's composable with other functions. There, we have three.

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Get Started With PostgreSQL

Select Distinct Data in Postgres

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