new t-sql features in sql server 2012
TRANSCRIPT
Richie Rump
@Jorriss
http://jorriss.net
• Sequences
• Data Paging
• Analytic Window Functions
• Conversion Functions
• Logical Functions
• Date/Time Functions
• String Functions
• New construct to generate numeric sequences.
• Ability to set min and max values
• Cycle will set the current value to the min value when the max value is reached
• Future values can be cached minimizing disk IO.
• Returns metadata for the supplied SQL statement.
• Useful for determining column/database information for a SQL statement or Stored Procedure.
• If set to 0, no information is returned.
• If set to 1, each query is analyzed as if it includes a FOR BROWSE option on the query. This will return base table names as the source column information.
• If set to 2, each query is analyzed as if it would be used in preparing or executing a cursor. This will return view names as source column information.
• Allows the changing of column names and data types in the resultset of a stored procedure.
• Yes, you can change column names when you call a stored procedure.
• Allows for server side paging.
• Not data pages (8K of awesome) but paging like on a web page.
• OFFSET AND FETCH are arguments of the ORDER BY clause
• OFFSET – Number of rows to skip
• FETCH – Number of rows to return
• LAG
• LEAD
• FIRST_VALUE
• LAST_VALUE
• PERCENT_RANK
• CUME_DIST
• PERCENTILE_CONT
• PERCENTILE_DISC
• The OVER clause determines the partitions and order of a rowset before the window function is applied.
• WHAT CHU TALKING ABOUT WILLIS?
• PARTITON BY – Similar to GROUP BY but only applies to the window function and not the entire query.
• ORDER BY – Specifies the order of the rows in the partition
• No longer need to use a self-join or CTE.
• LAG: Access data from previous rows in the result set.
• LEAD: Access data from future rows in the result set.
• FIRST_VALUE: Retrieves the first value in a partition.
• LAST_VALUE: Retrieves the last value in a partition.
• Calculates a relative rank of a row.
• (RANK() – 1) / (Total Rows – 1)
• Calculates the percentage of values less than or equal to the current value in the group.
• COUNT(*) OVER (ORDER BY Col1) / Total Count
• Calculates a percentile value
• Will interpolate the appropriate value
• Can use to find the median – PERCENTILE_CONT(0.5)
• CONT stands for continuous
• Calculates a percentile value
• Like PERCENTILE_CONT but will select a value that exists in the set.
• Can use to find the median – PERCENTILE_CONT(0.5)
• DISC stands for discrete distribution
• Attempts to parse a string and convert it to a specified datatype.
• Can only convert to a number or datetime
• Uses the .Net CLR
• Like PARSE but if an error occurs returns a NULL.
• Still uses the .Net CLR.
• Attempts to cast a value into a specified data type. Returns NULL if CONVERT fails.
• Immediate If aka Inline If
• Takes a boolean expression and returns one of two values.
• Shorthand for CASE.
• Has the same limitations as CASE– Can only be nested to 10 levels
• Returns a value from a list based on a specified index.
• If the specified index is not in the list NULL is returned.
• Returns the data type based on data type precedence.
• Returns last date of a specified month.
• Can specify a month_to_add argument to increment or decrement result.
• DATEFROMPARTS ( year, month, day)• DATETIME2FROMPARTS ( year, month, day, hour, minute,
seconds, fractions, precision )• DATETIMEFROMPARTS ( year, month, day, hour, minute,
seconds, milliseconds )• DATETIMEOFFSETFROMPARTS ( year, month, day, hour,
minute, seconds, fractions, hour_offset, minute_offset, precision )
• SMALLDATETIMEFROMPARTS ( year, month, day, hour, minute )
• TIMEFROMPARTS ( hour, minute, seconds, fractions, precision )
• Does what it says…concatenates strings together.
• NULLs are automatically converted to empty strings.
• Can pass other data types for concatenation.
• Simplifies the string formatting of dates and other data types.
• No more memorizing numeric predefined format values.
• Returns a string.
• Uses .Net CLR
• Reduces the need to use RAISERROR in TRY/CATCH blocks.
• Can provide custom error messages.
• Always uses severity level 16.
Denali T-SQL at a Glance - New and Enhanced Functionshttp://www.sqlmag.com/blog/puzzled-by-t-sql-blog-15/tsql/denali-tsql-glance-enhanced-functions-140785
T-SQL Improvements in SQL Server 2012 http://www.infoq.com/news/2012/03/T-SQL-2012
SQL SERVER – Denali – 14 New Functions – A Quick Guide http://blog.sqlauthority.com/2011/09/21/sql-server-denali-14-new-functions-a-quick-guide/
Performance Test of New Date Manipulation Functions (SQL Spackle)http://www.sqlservercentral.com/articles/Performance/89505/
Keyboard Shortcuts in Visual Studio 2012. Need to import settings.http://www.mssqltips.com/sqlservertip/2625/improvement-to-keyboard-shortcuts-in-sql-server-2012-management-studio/
• MSDN: http://msdn.microsoft.com/en-us/library/ff878091.aspx
• Sequence: Why they aren’t just for surrogate keys: http://blog.infoadvisors.com/index.php/2012/02/16/new-in-sql-server-2012-sequences-why-they-arent-just-for-surrogate-keys/
• Sequence in 2012: http://www.sql-server-performance.com/2011/sequence-sql-server-2011/
• Create Sequence: http://www.dbadiaries.com/new-t-sql-features-in-sql-server-2012-create-sequence/
• MSDN: http://msdn.microsoft.com/en-us/library/ff878602.aspx
• http://blog.sqlauthority.com/2012/03/31/sql-server-sp_describe_first_result_set-new-system-stored-procedure-in-sql-server-2012/
• MSDN: http://msdn.microsoft.com/en-us/library/ms188332.aspx
• WITH RESULT SETS http://www.dbadiaries.com/new-t-sql-features-in-sql-server-2012-with-result-sets/
• MSDN: http://msdn.microsoft.com/en-us/library/ms188385.aspx
• TSQL 2012 – OFFSET and FETCH: http://stevestedman.com/2012/04/tsql-2012-offset-and-fetch/
• OFFSET and FETCH: http://www.dbadiaries.com/new-t-sql-features-in-sql-server-2012-offset-and-fetch/
• LAG - MSDN: http://msdn.microsoft.com/en-us/library/hh231256
• LEAD - MSDN: http://msdn.microsoft.com/en-us/library/hh213125
• FIRST_VALUE - MSDN: http://msdn.microsoft.com/en-us/library/hh213018
• LAST_VALUE - MSDN: http://msdn.microsoft.com/en-us/library/hh231517
• MSDN: http://msdn.microsoft.com/en-us/library/hh213573.aspx
• Introduction to PERCENT_RANK(): http://blog.sqlauthority.com/2011/11/18/sql-server-introduction-to-percent_rank-analytic-functions-introduced-in-sql-server-2012/
• MSDN: http://technet.microsoft.com/en-us/library/hh231078.aspx
• Introduction to CUME_DIST: http://blog.sqlauthority.com/2011/11/08/sql-server-introduction-to-cume_dist-analytic-functions-introduced-in-sql-server-2012/
• PERCENTILE_CONT - MSDN: http://msdn.microsoft.com/en-us/library/hh231473.aspx
• Introduction to PERCENTILE_CONT: http://blog.sqlauthority.com/2011/11/20/sql-server-introduction-to-percentile_cont-analytic-functions-introduced-in-sql-server-2012/
• What exactly does PERCENTILE_CONT do? http://www.sqlskills.com/BLOGS/BOBB/post/What-exactly-does-PERCENTILE_CONT-do-anyhow.aspx
• PERCENTILE_DISC - MSDN: http://msdn.microsoft.com/en-us/library/hh231327
• Introduction to PERCENTILE_DISC: http://blog.sqlauthority.com/2011/11/22/sql-server-introduction-to-percentile_disc-analytic-functions-introduced-in-sql-server-2012/
• Difference between PARSE(), TRY_PARSE(), TRY_CONVERT(): http://blog.sqlauthority.com/2011/09/09/sql-server-denali-conversion-function-difference-between-parse-try_parse-try_convert/
• PARSE - MSDN: http://msdn.microsoft.com/en-us/library/hh213316.aspx
• TRY_PARSE - MSDN: http://msdn.microsoft.com/en-us/library/hh974669
• TRY_CONVERT - MSDN: http://msdn.microsoft.com/en-us/library/hh230993
• MSDN: http://msdn.microsoft.com/en-us/library/hh213574.aspx
• MSDN: http://msdn.microsoft.com/en-us/library/hh213019
• CHOOSE() – A Quick Introduction: http://blog.sqlauthority.com/2011/09/11/sql-server-denali-logical-function-choose-a-quick-introduction/
• MSDN: http://msdn.microsoft.com/en-us/library/hh213020.aspx
• EOMONTH() – A Quick Introduction: http://blog.sqlauthority.com/2011/09/20/sql-server-denali-date-and-time-functions-eomonth-a-quick-introduction/
• A Quick Introduction: http://blog.sqlauthority.com/2011/09/19/sql-server-denali-date-and-time-functions-datefromparts-datetimefromparts-datetime2fromparts-timefromparts-smalldatetimefromparts-datetimeoffsetfromparts-a-quick-introduc/
• MSDN: http://msdn.microsoft.com/en-us/library/hh231515.aspx
• MSDN: http://msdn.microsoft.com/en-us/library/hh213505.aspx
• New SQL Server Function to Format Dates: http://www.mssqltips.com/sqlservertip/2655/new-sql-server-function-to-format-dates/?utm_source=dailynewsletter&utm_medium=email&utm_content=headline&utm_campaign=2012427
• Custom Numeric Formats -http://msdn.microsoft.com/en-US/library/0c899ak8.aspx#SpecifierD
• http://www.dbadiaries.com/new-t-sql-features-in-sql-server-2012-throw/