Scripts

Technical Article

Backup Verification

The following script runs against the current server and retrieves number of days since last full or differential and the number of days between them. it also retrieves the number of hours since the last transaction log backup.It currently returns a grid output.currently the script is under going changes to send XML back to an […]

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2006-05-22 (first published: )

1,247 reads

Technical Article

To move all the table data from database to xls or

To move all the table data from database to xls or doc or txt files tableMany times we come accross to move data from database to external files such as word,xls or data files. Here is the script that move all tables data to specified files. Target file names are the table names. specify the […]

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2006-05-20 (first published: )

1,692 reads

Technical Article

Calculate distance between two points

The calculation of distance between two points using standard spherical geometry can be inaccurate for short distances (ten miles or less) because the sine function of very small angles approaches zero. The haversine approach (http://en.wikipedia.org/wiki/Haversine_formula) turns this around, so it is very accurate at small distances but has larger errors (about ten miles) for points […]

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2006-05-18 (first published: )

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Technical Article

BCP OUT all table data in your Database

Data Recovery is vital. This script will cursor through your database and BCP OUT the table data to a directory specifically for each day of the week (in numbers - where 1 = Sunday and 7 = Saturday) in order to have table recoverability up to 7 days. The first step is to create the […]

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2006-05-11 (first published: )

703 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;

See possible answers