PDF version of T-SQL Tutorial with content of Stored Procedures, SQL tutorial, Cursors, Triggers, Views, Functions, Data Types, Table Joins, Transactions, Interview Questions. T-SQL Select Query. T-SQL Stored Procedures. T-SQL for BI practitioners. CHAPTER 9 ) and parts of Inside Microsoft SQL Server T-SQL Programming (Microsoft. Press, ), this book. Although Transact-SQL has programming language features, you'd never want advantage to programming in Transact-SQL is that your routines execute on.

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Correlated subqueries containing Transact-SQL outer joins. in PDF format, and may also contain other documents or updated information not which users must resort to a programming language to accomplish a desired task . SQL Server T-SQL is based on standards created by the American. National will find that T-SQL is a very versatile and powerful programming language. Several people contributed to the T-SQL Querying and T-SQL Programming . advanced T-SQL querying, query tuning, and programming in Microsoft SQL.

I mostly skim through books and stopping on interesting and new things, which I don't know or probably have a misconception, but I do like to refer books many times. If I skim through a book, I know where can I find more information about a particular concept and then I explore it in more depth. I have learned a lot of technologies, programming languages, database, and frameworks by reading books and that's why I also love to share good resources whenever I find them, particularly free ones.

I like to write SQL query and optimize it and that's why I always read books on databases. In this article, I am going to share 4 free books, first is about database performance tips for developers, perfectly suited to me and many Java developers who write stored procedures, queries, and SQL scripts and this is one of those books, which I think every developer should read.

The second book in the list is about SQL code smells, which talks about common SQL practices which every programmer should avoid dealing with the database. It contains code smells and I think the list is probably growing to , you can find more SQL code smells on their website.

This is again a good book for all developers who write SQL queries or deal with the database.

The third and fourth book is about Microsoft SQL Server database, one focus on transaction log management, probably an advanced concept for many developers but very useful for DBAs and the second one is an introductory book on Microsoft SQL server database. These are the books which are made available free from publisher and authors for the benefit of the community.

You can either download their PDF version for offline reading or you can read them online.

Use the Index, Luke! Markus Winand Download: This book is for developers; it avoids unnecessary details about database internals. That's all in this list of Free SQL books for beginners and experienced developers. You can download these books as free PDF or read them online as well.

Getting Started

The reference becomes a foreign key in the second table. Indexes An index is an on-disk structure associated with a table or a view that speeds retrieval of rows from the table or the view. An index contains keys built from one or more columns in the table or the view.

These keys are stored in a structure B-tree that enables SQL Server to find the row or rows associated with the key values quickly and efficiently. These are the columns included in the index definition. There can be only one clustered index per table, because the data rows themselves can be sorted in only one order. When a table has a clustered index, the table is called a clustered table.

If a table has no clustered index, its data rows are stored in an unordered structure called a heap. A nonclustered index contains the nonclustered index key values and each key value entry has a pointer to the data row that contains the key value.

The structure of the row locator depends on whether the data pages are stored in a heap or a clustered table. For a heap, a row locator is a pointer to the row.

For a clustered table, the row locator is the clustered index key. The default value is used when inserting a new row in a table and a particular column in the insert statement does not have a value.

For example you may have a default of all that you may want to set up as a default end date. User defined functions are created and used for actions repeated within an application. An example is adding dashes to social security number. This user defined function could be created and used any time a correctly formatted social security number is required. If the END CATCH statement is the last statement in a stored procedure or trigger, control is returned to the code that invoked the stored procedure or trigger.

If the END CATCH statement is the last statement in a stored procedure or trigger, control is passed to the statement that invoked the stored procedure or trigger. Using this syntax for joins is discouraged by Microsoft because of the potential for ambiguous interpretation and because it is nonstandard.

Be sure to use the join syntax.

Pick the join order carefully. The majority of outer joins can successfully be rewritten as inner joins with tremendous performance improvements. This is a coding best practice that leads to more maintainable code and database systems. Null Comparisons Database SQL developers, check stored procedures, views, functions and triggers to flag the use of equality and inequality comparisons involving a NULL constant.


Avoid using this feature in new development work, and plan to modify applications that currently use this feature. It is recommended to use quoted identifiers instead. String aliases are not supported in future releases of SQL Server. Tables without a Primary Key defined or a column with a unique constraint defined will not be approved.

Foreign keys are also defined as indexes. Database Administrators check stored procedures, functions, views and triggers for use of schema qualified names when referencing tables and views. However, it is recommended that at least the schema name be specified to identify a table or view inside a stored procedure, function, view or trigger. The default schema corresponds to the current user for adhoc batches, and corresponds to the schema of a stored procedure when inside one.

In either case, SQL Server incurs an additional runtime cost to verify schema binding of unqualified objects. Applications are more maintainable and may experience a slight performance improvement if object references are schema qualified.

It is recommended to specify sort criteria when using TOP clause. Otherwise, the results produced are plan dependent and may lead to undesired behaviour.

Avoid Stored Procedure Recompiles Performance Recommendations General Considerations Stored procedures perform one process and not a series of processes. It is better to create a stored procedure that performs an insert rather than a stored procedure that performs an insert, update and a delete.

Executing multiple stored procedures is preferred over executing one, unwieldy, multi-task stored procedure. If data operations are mixed, the SQL server must recompile procedures each time to determine the best plan to use for each new or dropped object.

Therefore, coding all creates and drops together reduces the amount of stored procedure compiles. Avoid using a DROP statement for temporary tables in stored procedures, because tables are automatically dropped when the procedure is completed.

Specifying the owner of objects such as dbo. Tablename and dbo. Stored procedure name cuts down on recompiles. Temporary Tables Often procedure throughput can be dramatically improved by the use of temporary tables. Please note: use a temporary table to manipulate small amounts of data, and if data exceeds records add an index. Table Variable Type The table variable type functions exactly like the temporary table, with the exception that all data is loaded directly in random access memory.

Temporary Tables vs.

The Sixth Extinction An Unnatural History by Elizabeth Kolbert

Table Variable Database SQL developers check stored procedures and triggers for usages of temporary tables that may be replaced by use of table variables.

When a procedure creates a temporary table and has no CREATE INDEX issued on it, and it is dropped all in the same procedure, consider using table variables instead to potentially observe fewer recompilations.

Note that if large data volumes are inserted in the temporary table it may still be preferred to use temporary tables over table variables due to parallel execution restrictions and statistics maintenance.Rubber Cement: Basic Python by examples 1.

NET Framework. Temporary Tables vs.

B input the data. Help Center Find new research papers in: Do not write stored procedures that exceed four pages in length excluding comments, headers, and maintenance log.

A page selection can be set in the form of comma separated page intervals Ex.

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