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SQL LIKE Operator

The LIKE operator is used to list all rows in a table whose column values match a specified pattern. It is useful when you want to search rows to match a specific pattern, or when you do not know the entire value. For this purpose we use a wildcard character ‘%’.

For example: To select all the students whose name begins with ‘S’

SELECT first_name, last_name
FROM student_details
WHERE first_name LIKE ‘S%’;

The output would be similar to:

first_name          last_name
————-          ————-
Stephen                 Fleming
Shekar                   Gowda

The above select statement searches for all the rows where the first letter of the column first_name is ‘S’ and rest of the letters in the name can be any character.

MS SQL Server – Editions

SQL Server is available in various editions. This chapter lists the multiple editions with its features.

Enterprise − This is the top-end edition with a full feature set.

Standard − This has less features than Enterprise, when there is no requirement of advanced features.

Workgroup − This is suitable for remote offices of a larger company.

Web − This is designed for web applications.

Developer − This is similar to Enterprise, but licensed to only one user for development, testing and demo. It can be easily upgraded to Enterprise without reinstallation.

Express − This is free entry level database. It can utilize only 1 CPU and 1 GB memory, the maximum size of the database is 10 GB.

Compact − This is free embedded database for mobile application development. The maximum size of the database is 4 GB.

Datacenter − The major change in new SQL Server 2008 R2 is Datacenter Edition. The Datacenter edition has no memory limitation and offers support for more than 25 instances.

Business Intelligence − Business Intelligence Edition is a new introduction in SQL Server 2012. This edition includes all the features in the Standard edition and support for advanced BI features such as Power View and PowerPivot, but it lacks support for advanced availability features like AlwaysOn Availability Groups and other online operations.

Enterprise Evaluation − The SQL Server Evaluation Edition is a great way to get a fully functional and free instance of SQL Server for learning and developing solutions. This edition has a built-in expiry of 6 months from the time that you install it.

2005 2008 2008 R2 2012 2014
Enterprise Yes Yes Yes Yes
Standard Yes Yes Yes Yes
Developer Yes Yes Yes Yes
Workgroup Yes Yes No No
Win Compact Edition – Mobile Yes Yes Yes Yes
Enterprise Evaluation Yes Yes Yes Yes
Express Yes Yes Yes Yes
Web Yes Yes Yes
Datacenter No No
Business Intelligence Yes

Using of Where Clause in SQL Server

Using of Where Clause in SQL Server

This SQL Server tutorial explains how to use the WHERE clause in SQL Server (Transact-SQL) with syntax and examples.

Description

The SQL Server (Transact-SQL) WHERE clause is used to filter the results from a SELECT, INSERT, UPDATE, or DELETE statement.

Syntax

WHERE conditions;

Parameters or Arguments

conditions : The conditions that must be met for records to be selected.

For example:

SELECT * FROM employees WHERE first_name = ‘Jane’;

In this SQL Server WHERE clause example, we’ve used the WHERE clause to filter our results from the employees table. The SELECT statement above would return all rows from the employees table where the first_name is ‘Jane’. Because the * is used in the SELECT, all fields from the employees table would appear in the result set.

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Use SQL Server Management Studio (SSMS) on Windows to manage SQL Server on Linux

This topic shows how to use SQL Server Management Studio (SSMS) to connect to SQL Server 2017 on Linux. SSMS is a Windows application, so use SSMS when you have a Windows machine that can connect to a remote SQL Server instance on Linux.

After successfully connecting, you run a simple Transact-SQL (T-SQL) query to verify communication with the database.

Install the newest version of SQL Server Management Studio

When working with SQL Server, you should always use the most recent version of SQL Server Management Studio (SSMS). The latest version of SSMS is continually updated and optimized and currently works with SQL Server 2017 on Linux. To download and install the latest version, see Download SQL Server Management Studio. To stay up-to-date, the latest version of SSMS prompts you when there is a new version available to download.

Connect to SQL Server on Linux

The following steps show how to connect to SQL Server 2017 on Linux with SSMS.

  1. Start SSMS by typing Microsoft SQL Server Management Studioin the Windows search box, and then click the desktop app.
    1. In the Connect to Serverwindow, enter the following information (if SSMS is already running, click Connect > Database Engine to open the Connect to Server window):

     

    Setting Description
    Server type The default is database engine; do not change this value.
    Server name Enter the name of the target Linux SQL Server machine or its IP address.
    Authentication For SQL Server 2017 on Linux, use SQL Server Authentication.
    Login Enter the name of a user with access to a database on the server (for example, the default SA account created during setup).
    Password Enter the password for the specified user (for the SA account, you created this during setup).

  2. Click Connect.
  3. After successfully connecting to your SQL Sever, Object Explorer opens and you can now access your database to perform administrative tasks or query data.

    Run sample queries

    After you connect to your server, you can connect to a database and run a sample query. If you are new to writing queries, see Writing Transact-SQL Statements.

    1. Identify a database to use to run a query against. This could be a new database you created in the Transact-SQL tutorial. Or it could be the AdventureWorks sample database that you downloaded and restored.
    2. In Object Explorer, navigate to the target database on the server.
    3. Right-click the database and then select New Query:

    4. n the query window, write a Transact-SQL query to select data from one of the tables. The following example selects data from the Production.Product table of the AdventureWorks database.

       SELECT TOP 10 Name, ProductNumber
       FROM Production.Product
       ORDER BY Name ASC
    5. Click the Execute button:

3rd Normal Form (3NF)

Third normal form:

In second normal form, all columns in the table rely on the primary key and the table has a singular purpose

There could be relationships between the columns… dependencies could lurk within these columns called transitive dependence.

Transitive dependence means that a value of a column/field within a table relies on a another column in that same table, but this is facilitated through another column between them.

A table is in third normal form when the following conditions are met:

  • It is in second normal form.
  • All nonprimary fields are dependent on the primary key.

Again, transitive dependence means dependence between columns of the same table. Think of ArtistNationality, Artist, and Artwork. The values for ArtistNationality and Artist depend on the Artwork; once you figure out the Artwork, you know the Artist/ArtistNationality. But ArtistNationality depends on the value from Artist: This is a transitive dependence.

In order to get to third normal form, we need to make sure all columns are only dependent upon the primary key. That means we have to get the country code out of the artist table. In the following example, we’ve added country name to the table to further highlight the issue with normalizing

It’s fine that the country code exists in the artist table, but having the country name breaks the 3rd normal form rule, since we can’t get the country name without the code; we can’t get the code without the artist ID. This is by nature the definition of transitive dependence.

Let’s look at some examples that will use the fictional music database as a subject.

we’ll create another table called countries, move the country code and country name to this table. Country code becomes the primary key in the countries table, but is retained in the artist table as a foreign key.

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