TSQL Challenge 55 - Multiply two very long decimal strings and return
This challenge to multiply two positive integer strings and return their product. The strings can be really long: up to 1024 digits
2011-05-02
1,292 reads
Jacob Sebastian
TSQL Challenge 54 - Find the longest matching area code
Your job is to write a query that identifies the longest matching country/area code from each phone number based on the information stored in an area-code reference table.
2011-04-18
1,187 reads
TSQL Challenge 53 - Finding empty and non-empty intervals
A SQL Server instance is set up to log the session start time and end time into a table. Given this table, your job is to find all time intervals in which no one is logged in.
2011-04-04
1,522 reads
TSQL Challenge 52: Recursive Wage Calculation in a Parent-Child dimens
This challenge is intended to calculate company's wage spent below a top level manager.
2011-03-21
1,617 reads
TSQL Challenge 51 - Convert long Binary strings to Decimal strings
This challenge invites you to write a query that converts binary values into decimal format.
2011-03-07
6,696 reads
TSQL Challenge 50 - Extracting a specifical range from random data wit
The purpose of this challenge is to test your query writing skills with a limited set of TSQL keywords.
2011-02-21
1,701 reads
TSQL Challenge 49 - Identify overlapping time sheet entries of field t
Several technicians are sent to a customer premises to do a certain maintenance work. Your task is to process the activity log entered by each technician and identify overlaps.
2011-02-07
1,393 reads
TSQL Challenge 48 - Parse and evaluate Arithmetic Expressions using TS
This challenge is to parse and evaluate arithmetic expressions using TSQL.
2011-01-24
2,279 reads
TSQL Challenge 47 - Read the modification history and identify the fir
A table contains the list of modifications made to each card. Your job is to write a query that shows the first number, current number (most recent) and the number of changes made.
2011-01-10
944 reads
TSQL Challenge 46 - Remove leading occurrences of the first character
This challenge is a slightly enhanced version of the ‘remove leading zeros’ problem
2010-12-27
1,712 reads
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Question of the Day
Crazy Code I
I have this data in my Customer table:
CustomerID CustomerName 1 Steve 2 Andy 3 Brian 4 Allen 5 DevinI run this code:
SELECT
t.CustomerID
, c.value
FROM
( SELECT
CustomerID
, STRING_AGG (CustomerName, ',') AS me
FROM customer
GROUP BY CustomerID) t
CROSS APPLY STRING_SPLIT(me, ',') c;
What is returned? See possible answers