Advanced SQL and Functions. Stephen Frost [email protected] computerescue.info Joe Conway [email protected] Crunchy Data. Advanced SQL Database Programmers. Handbook. Donald K. Burleson. Joe Celko. John Paul Cook. Peter Gulutzan. Advanced SQL. Solutions to Practice Exercises. Query: create table loan. ( loan number char(10), branch name char(15), amount integer, primary key (loan .
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Present the overview of basic SQL capabilities. ✓ Explain several selected advanced SQL features. ➢ Outline. ✓ Introduction. ✓ SQL basics. Download free courses materials, tutorials training on advanced sql in PDF files. SQL and Database environments. • Managing Database objects. • Managing data. • SQL Functions. • Advanced SQL Queries. • SQL Stored Procedures.
The list of defined triggers can be viewed using the following query. Displaying Internal Tables Internal tables are formed as a by-product of a user-action and are usually not accessible.
The data in internal tables cannot be manipulated; however, the metadata of the internal tables can be viewed using the following query. Displaying a List of Procedures A stored procedure is a group of SQL queries that logically form a single unit and perform a particular task. Swapping the Values of Two Columns in a table In this and subsequent examples, we will use a common company database including several tables which are easily visualized.
Our practice DB will include a Customers table and an Order table. With this in mind, we can easily imagine an Orders table which likewise contains the indexed customer ID field, along with details of each order placed by the customer.
In our first one of SQL examples, imagine a situation where the zip and phone fields were transposed and all the phone numbers were erroneously entered into the zip code field.
Returning a Column of Unique Values Now, suppose that our data entry operator added the same Customers to the Customers table more than once by mistake.
As you know, proper indexing requires that the key field contain only unique values. Between Monday and Tuesday Today is Wednesday, and we arrive at work and discover that our new data entry clerk in training has entered all new orders incorrectly on Monday and Tuesday.
We wish to teach our new trainee to find and correct all erroneous records. Finding the Intersection of Two Tables Undoubtedly the whole reason that a relational database exists in the first place is to find matching records in two tables! Making Column Labels More Friendly Aliasing column labels give us the convenience of renaming a column label to something more readable.
There is a tradeoff when naming columns to make them succinct results in reduced readability in subsequent daily use.
In our Orders table, the item column contains the description of downloadd products. Always and Everywhere!
This is especially so when installing a new web app and the UI asks new users to enter names for DBs to be added during installation. It contains rows and columns similar to a real table. The fields in the view are fields from one or more real tables.
Views do not contain data of their own. They are used to restrict access to the database or to hide data complexity.
What are the advantages of Views? Some of the advantages of Views are Views occupy no space Views are used to simply retrieve the results of complicated queries that need to be executed often.
Views are used to restrict access to the database or to hide data complexity. What is a relationship and what are they?
Database Relationship is defined as the connection between the tables in a database. There are various database relationships namely 1. One to One Relationship 2. One to Many Relationship 3. Many to One Relationship 4. Self-Referencing Relationship What is a query?
Advanced SQL - Structured Query Language
A database query is a request for data or information from a database table or combination of tables. A database query can be either a select query or an action query.
What is a Subquery? A Subquery is a SQL query within another query.
SQL Tutorial for Beginners: Learn SQL in 7 Days
It is a subset of a Select statement whose return values are used in filtering the conditions of the main query. What are the types of subquery?
There are two types of subquery: 1. Correlated: In a SQL database query, a correlated subquery is a subquery that uses values from the outer query in order to complete.
Because a correlated subquery requires the outer query to be executed first, the correlated subquery must run once for every row in the outer query.
It is also known as a synchronized subquery. Non-Correlated: A Non-correlated subquery is a subquery in which both outer query and inner query are independent to each other.
What is Synchronized Subquery? Refer Correlated Subquery. What is the difference between Local Variables and Global Variables? Local Variables: Local variables can be used or exist only inside the function.
1. Query for Retrieving Tables
These variables are not used or referred by any other functions. These are not known to other functions.
Variables can be created whenever that function is called. Global Variables: Global variables can be used or exist throughout the program.Swapping the Values of Two Columns in a table In this and subsequent examples, we will use a common company database including several tables which are easily visualized. Finding the Intersection of Two Tables Undoubtedly the whole reason that a relational database exists in the first place is to find matching records in two tables!
Summary list may specify more than one column. Learning has never been so simple and easy. Advanced Word Advanced SQL programming, second edition La description SQL for Smarties was hailed as the first book devoted explicitly to the advanced techniques you need to transform yourself into an expert SQL programmer.
The index can be created on one column or a group of columns.
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