The most fundamental task you’ll have to learn to do as a Database Administrator is to create a database. Please remember it’s probably a good idea to make sure you’re connected to the master database on your server when creating databases. Don’t change your connection to your database until you’ve closed out your CREATE DATABASE…
Year: 2007
Alias
Within a few days of using SQL, you’re going to start wondering if there is a way to speed up your code writing. The good news is you can do that with Aliases. You can give a table or a column another name by using an alias. This can be a good thing to do…
ALTER TABLE
After you’ve spent time designing the perfect table, someone is going to come along and ask you a question that will lead you to changing your table. It can be something as simple as, hey, we can only store 25 characters for a city name, we need to have 50. Or it can be a…
SQL 201-SELECT INTO
I’ve already shown you how to create a table, and how to INSERT data into that table. But did you know you can do both in one statement? The SELECT INTO statement selects data from one table and inserts it into a different table. I use the SELECT INTO statement is to create backup copies…
SQL 201 – Locking Hints
If you’ve spent any time looking at another programmers code, I’m sure you’ve see something like this: SELECT columnName FROM tableName (NOLOCK) I’m sure you asked yourself what the (NOLOCK) was all about, right? Well, it’s time I explained. The keywords in the parenthesis are referred to as table or locking hints. A lock is…
SQL 102 – Foreign Keys
In the simplest terms a Foreign Key in one table refers to the Primary Key of another table. Let’s go back to our demo tables products and productSales. –Products: productName price quantity color ———– —– ——– —– pencil 0.25 100 yellow pen 0.99 73 blue paper 1.00 500 white Mountain Dew 1.25 8 green –prodctSales:…