Scripts

Technical Article

Selecting XML out

I have a table with multiple rows for Description belonging to one Heading. For each row of data I need a .The xml should look like this: A heading 234567890123456789010 234567890123456789010 234567890123456789010   ...(to ) A heading 234567890123456789010 234567890123456789010   ...(to )

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2003-10-03

307 reads

Technical Article

Creating a Dynamic Crosstab Query

Crosstab queries (also called "pivot tables") in which you know beforehand the number of column values to aggregate by, can easily be performed in T-SQL using CASE statements wrapped in the SUM function.  Where things get tricky, however, is when you don't know how many aggregation values exist, and you are required to write a […]

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2003-09-26

3,723 reads

Technical Article

SP_HELPTEXT Modified for XML

This is the standard sp_helptext from SQL Server 2000 modified slightly to return the object definition as an XML document.The document is structured in the following format:I admit it was not a lot of work since I merely modified the final SELECT statement from Microsoft's own procedure, but I still find this very useful.The only […]

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2003-09-26

220 reads

Technical Article

Haversine Calculation in User Defined Function

Uses the haversine formula to calculate distance between 2 long / lat points.  This can be used with a zip code / lat and long table that are available from the census bureau or post office.The @R can be tweaked dependent on what gives you the best result (its the radius of the earth, fluctuates […]

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2003-09-25

781 reads

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Question of the Day

The string_agg function

We create the following table and then insert some records in it:

create table t1 (
   id int primary key,
   category char(1) not null,
   product varchar(50)
);

insert into t1 values
(1, 'A', 'Product 1'),
(2, 'A', 'Product 2'),
(3, 'A', 'Product 3'),
(4, 'B', 'Product 4'),
(5, 'B', 'Product 5');
What happens if we execute the following query in both Sql Server and PostgreSQL?
select id, 
category, 
string_agg(product, ';')
                 over (partition by category order by id
                 rows between unbounded preceding and unbounded following) as stragg
from t1;

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