Contributors: Sundeep Abraham, Angela Amor, Geeta Arora, Vikas Arora, Lance Ashdown, Hermann. Baer, Shrikanth Bellamkonda, Donna. This tutorial shows you how to create a PDF report that contains a table and graph utilizing easily create a PDF file that contains the results of multiple queries. Many of the examples in this book use the sample schemas, which are installed by in examples, text that appears on the screen, or text that you enter.
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The information contained in this document is subject to change without notice. If you find any problems in the documentation, please report them to us in writing. about optimization of SQL queries and PL/SQL scripts, however, .. Note: You can automatically generate documentation (HTML, PDF, CHM, display metadata from Oracle's data dictionary exist too: for example, the xSQL's. In the following discussions and examples we use an example database to manage the following we restrict our attention to simple SQL queries and defer the.
Here are a few of the most important ones — each of these queries is consequential to almost every system that interacts with an SQL database.
Tables; This is perhaps the most widely used of SQL queries examples. In addition, it groups the results according to the country of each customer.
Query for Creating a View A view is a tailored table that is formed as a result of a query. It has tables and rows just like any other table.
Query for Retrieving a View The standard syntax of selecting attributes from a table is applicable to views as well.
Query to Display User Tables A user-defined table is a representation of defined information in a table, and they can be used as arguments for procedures or user-defined functions. Query to Display Primary Keys A primary key uniquely identifies all values within a table.
Displaying Foreign Keys Foreign keys link one table to another — they are attributes in one table which refer to the primary key of another table.
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.
Baer, Shrikanth Bellamkonda, Donna.
The information contained in this document is subject to change without notice. If you find any problems in the documentation, please report them to us in writing. Are the examples correct?
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Recursive stored procedure refers to a stored procedure which calls by itself until it reaches some boundary condition. This recursive function or procedure helps the programmers to use the same set of code n number of times.
SQL clause helps to limit the result set by providing a condition to the query. A clause helps to filter the rows from the entire set of records.
Complex SQL Queries
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Following are the ways in which dynamic SQL can be executed: Write a query with parameters. Using EXEC.
50 SQL Query Questions and Answers for Practice
What are the various levels of constraints? Constraints are the representation of a column to enforce data entity and consistency. How can you fetch common records from two tables?
For example: 1 Select studentID from student. List some case manipulation functions in SQL? It takes a string as an argument and returns it by converting it into lower case.Now we want to apply an aggregate function on the records of the first rank.
As an example, this next query fetches a list of customers by the region where there is at least one customer per region: For example, the following SQL statement, like the example on the slide, displays all. We can extend the functionality of the Primary Key so that it automatically increments from a base.
A view is a tailored table that is formed as a result of a query.
Thus, using the following query you can keep track of them:. Using EXEC. Displaying Foreign Keys Foreign keys link one table to another — they are attributes in one table which refer to the primary key of another table.