What are the most important SQL queries for beginners?
You can easily do all of this by writing basic SQL queries. This guide discusses the 30 most important SQL queries for beginners. Let's take a look. 1. Retrieving Data From All Columns This is a very basic query to display all data from a table. Notice that this query only has one character after SELECT: "*" (this denotes all columns).
What are the different types of SQL queries?
We started with simple SQL query examples using SELECT - FROM - WHERE statements and made our way to slightly more complex SQL queries using joins, union and nested queries. We covered a lot in the tutorial, however this is NOT an exhaustive list of all possible simple and advanced SQL queries - there are more.
How many basic SQL queries are in a starter pack?
These 20 basic queries are a must in a starter pack for every SQL beginner. These examples will get you going on your journey to mastering SQL. You’ve set your mind on learning SQL, googled ‘basic sql query examples’ or something similar, and here you are staring at this article. Now what?
What is a SQL query?
An SQL query is a statement built by putting together various SQL commands. These SQL commands together perform a specific task to access, manage, modify, update, control, and organize your data stored in a database and managed via a DBMS. Why use SQL?
Select
SELECT is probably the most commonly-used SQL statement. You'll use it pretty much every time you query data with SQL. It allows you to define what data you want your query to return. For example, in the code below, we’re selecting a column called name from a table called customers.
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Select Distinct
SELECT DISTINCT only returns data that is distinct — in other words, if there are duplicate records, it will return only one copy of each. The code below would return only rows with a unique name from the customerstable.
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Select Top
SELECT TOP only returns the top xnumber or percent from a table. The code below would return the top 50 results from the customerstable: The code below would return the top 50 percent of the customers table:
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as
AS renames a column or table with an alias that we can choose. For example, in the code below, we’re renaming the name column as first_name:
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Where
WHERE filters your query to only return results that match a set condition. We can use this together with conditional operators like =, >, <, >=, <=, etc.
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and
AND combines two or more conditions in a single query. All of the conditions must be met for the result to be returned.
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Or
OR combines two or more conditions in a single query. Only one of the conditions must be met for a result to be returned.
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Like
LIKE searches for a specified pattern in a column. In the example code below, any row with a name that included the characters Bob would be returned. Other operators for LIKE: 1. %x— will select all values that begin with x 2. %x%— will select all values that include x 3. x%— will select all values that end with x 4. x%y— will select all values tha
Create Database
CREATE DATABASE creates a new database, assuming the user running the command has the correct admin rights.
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Create Table
CREATE TABLE creates a new table inside a database. The terms int and varchar(255)in this example specify the datatypes of the columns we're creating.
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