Wise Owl Training - SQL blogs (page 3 of 4)

Use the GROUP BY clause in SQL for statistics

Posted by Andy Brown on 14 December 2012

If you want to average, count, sum or perform any other statistic on values in SQL, you need to learn the GROUP BY and HAVING parts of a SQL statement. That's where this online tutorial comes in!

How to do calculations and expressions in T-SQL

Posted by Andy Brown on 11 December 2012

You can use SQL to do everything from simple arithmetic through to complicated functions - this blog gives you the low-down!

Creating computed columns in SQL tables

Posted by Andy Brown on 10 December 2012

This short blog explains how you can create calculated formulae for fields in an SQL table (known as "computed columns").

Writing inner joins and outer joins in SQL

Posted by Andy Brown on 30 November 2012

An in-depth SQL tutorial on how to create inner joins, left outer joins, right outer joins, full outer joins, cross joins and self-joins!

SQL Server - create databases, tables and relationships

Posted by Andy Brown on 19 November 2012

A guide to how to create databases in SQL Server Management Studio, including creating tables, indexing columns and using database diagrams to create relationships between tables.

Setting SQL criteria using the WHERE clause

Posted by Andy Brown on 08 November 2012

If you don't want to see a full set of records from a table in SQL, you can use a WHERE statement to filter out unwanted rows, as shown in this blog.

Using SELECT INTO and INSERT to insert SQL rows

Posted by Andy Brown on 12 October 2012

There are various ways to insert data into new or existing tables in T-SQL - this blog gives examples of each.

Using T-SQL to create tables programmatically

Posted by Andy Brown on 05 October 2012

SQL doesn’t just select data; you can also use it to create tables and link them together with relationships. This blog shows you how!

T-SQL data types - int, float, decimal, varchar, etc.

Posted by Andy Brown on 05 October 2012

Whether you're creating tables in SQL Server, using SQL variables or passing parameters to stored procedures, you'll need to understand what the possible data types that you can use are.

Use SQL, parameters and bookmarks to create a grid of clickable links

Posted by Andy Brown on 06 August 2012

To make report navigation easier, you can create a 2-dimensional matrix of clickable links at the top of a report. This blog shows you how!

Using ORDER BY to Sort in SQL Server Queries

Posted by Andrew Gould on 23 July 2012

If your SQL queries return lots of records you'll probably want to sort the results in some kind of order. This blog teaches you how to use the ORDER BY clause to do exactly that!

Basic SQL Queries

Posted by Andrew Gould on 23 July 2012

This blog teaches the absolute basics of writing queries in Microsoft SQL Server Management Studio. You'll learn how to use the SELECT and FROM keywords to create simple queries showing all of the records from a single table.

Dynamic SQL - No, No, No!

Posted by David Wakefield on 02 July 2012

Dynamic SQL should only be used as a last resort. This article gives you a tip for avoiding the use of dynamic SQL in WHERE clauses

Link SQL Views to MS Access using VBA

Posted by David Wakefield on 26 June 2012

How to link SQL Views and Tables to MS Access using VBA without getting the annoying Unique Record Identifier pop up.

SQL stored procedures and passing parameters

Posted by Andy Brown on 24 May 2012

Stored procedures are programs in SQL which allow you to pass parameters to queries and manipulate sets of rows in tables. Find out how to write them with this online training blog!

New in SQL 2012 - code snippets and surrounding code

Posted by Andy Brown on 15 May 2012

In a previous blog on new features of SQL 2012, I missed out the ability to insert code snippets, and also to embed or surround code in an IF, BEGIN or WHILE block. This blog rectifies this!

New features for SQL within SQL Server 2012

Posted by Andy Brown on 08 May 2012

SQL 2012 has 14 new functions, a new FileTable construct and new ways to sequence and fetch records - as this blog explains.

Introduction to SQL Server Management Studio

Posted by Andrew Gould on 30 April 2012

Before you get into writing SQL Queries you should take some time to familiarise yourself with the application in which you'll be spending most of your time. This blog shows you the basics of SQL Server Management Studio.

Designing databases for SQL Server and Access

Posted by Andy Brown on 23 April 2012

Designing relational databases is easy once you learn the few basic rules, and the procedure is identical whether you're using SQL Server or Access. This blog illuminates the subject!

Scheduling Data Imports in SQL Server

Posted by Andrew Gould on 27 February 2012

If you frequently import data into a SQL Server database from the same source you'll probably be sick of going through the import wizard again and again. So why not learn how to schedule an automatic import of your data using SSIS packages and the SQL Server Agent? This blog explains how to do exactly that!