Scripts

Technical Article

Progressive Sums in T-SQL

A common problem in sql is how to calculate and process, for the current row, information that is based on the results (sum, product, difference, etc) of the rows read so far.A solution (we use) to this problem is to create a self join query based on the primary key using the condition of "greater […]

(1)

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2006-03-23 (first published: )

453 reads

Technical Article

Improved Move indexes to new file group

This is an improved and expanded version of the previously posted script that moves indexes to a new file group. This version will:1. Create new filegrup and files for indexes2. Script out and recreate indexes on new drive3. NEW* output report to text file4. NEW* Will run with enclosed wrapper for ALL DATABASES ON THE […]

(3)

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2006-03-22 (first published: )

2,049 reads

Technical Article

Script all indexes as CREATE INDEX statements

this script will generate CREATE index statements for all indexes in the database;there are already scripts out there that script constraints for primary keys and unique constraints, which automatically create an index behind the scenes. but what about the other indexes?uncomment two statements in order to filter out primary keys and Unique indexes so you […]

(18)

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2006-03-17 (first published: )

30,750 reads

Technical Article

Business Time in Seconds Function

SQL Function to calculate number of business seconds between 2 datetime fields. Input Parameters: @startdate - Start Time (datatype DateTime) @enddate - End Time (datatype DateTime) @starthour - Start of Business Day (datatype DateTime) (Format: '1900-01-01 9:00:00') @endhour - End of Business Day (datatype DateTime) (Format: '1900-01-01 17:00:00') @workdays - Business Day string - Use […]

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2006-03-15 (first published: )

257 reads

Technical Article

User Defined Function for Padding Numbers

This scalar udf takes three parameters @Number INT, @Length INT, @Position CHAR(1) and returns a VARCHAR(50) string which pads @Number with zeros to the specified @Length either to the right or to the left, according to @Position ('L' or 'R').E.g. SELECT dbo.udf_PadNumber(5, 6, 'L') returns '000005' whereas SELECT dbo.udf_PadNumber(5, 6, 'R') returns '500000'. The function […]

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2006-03-13 (first published: )

173 reads

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Question of the Day

ORDER BY alias

There is a table tmp_tab:

CREATE TABLE tmp_tab (
id int,
val int
);
INSERT INTO tmp_tab VALUES
(1, 1),
(2, NULL),
(3, 3),
(4, 4),
(5, 5);
You want to order the rows ids by the following expression:
    ISNULL(val, id) + 1
Which of the following queries produces the expected ordering and why? (Select all correct)

See possible answers