# how to find gap in a range.

Posts: 1 New member
edited January 12, 2020 7:18AM

I use sql 2012 but, one can answer up to 2019

create table t ( b decimal(13,4) not null, c decimal(13,4) not null);
Insert into T (B,C) values ( 1,200);
Insert into T (B,C) values (   200   ,400);
Insert into T (B,C) values (  600,   900);

create table t1 (b decimal(13,4) not null, c decimal(13,4) not null);
Insert into t1 (B,C) values ( 1,100);
Insert into t1 (B,C) values (  200   ,500);
Insert into t1 (B,C) values (  800,   1000);

-- "t" and "t1" table holds ranges which could be any thing where b<c, i have to find out where "t" has range but "t1" does not?
--ex "t"  has 1,200 , "t1"  1,100  so i want to see 100 to 200 t2 does not have any thing.

Q) i have to find out the range where "t" has got range but "t1" does not? that means start range and end range will be passed

and i have to find out the range where "t1" is not done but "t" is done

-- case 1 table "t" and "t1" will have no overlap  with in the table

-- case 2 they will have overlap with in the table.

result

100 -200

600 - 800

yours sincerley

• Posts: 2 New member
Off the top of my head, that sounds like a variation of the "gaps and islands" problem. In T-SQL you can use window functions (or other ways) to solve the basic problem, maybe you can extend that approach. Look here, for example: https://www.red-gate.com/simple-talk/sql/t-sql-programming/the-sql-of-gaps-and-islands-in-sequences/
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edited April 15, 2020 4:10AM
You need to identify any ranges not included between 0 and 1. Note that some ranges do overlap. The exclusivity of the endpoints is not relevant for use case; You only need to identify what the endpoints of the gaps.

Here is the table structure:

DECLARE @ CheckRegister TABLE
(
AccountNumber Varchar(10),
CheckNumber Varchar(10)
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edited February 26, 2021 5:35PM
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he way you find gaps in a range depends on the context and what kind of data you're working with. Here are some general approaches:

Finding missing numbers in a sequence:

• Manual inspection: If you have a small dataset, you can simply look for missing numbers between the highest and lowest values.
• Sorting and comparison: Sort your data and then compare consecutive elements to identify missing values.
• Spreadsheet functions: Many spreadsheet programs have built-in functions to find gaps in sequences. For example, in Excel, you can use a combination of MIN, MAX, and SEQUENCE functions to identify missing numbers.
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edited April 9, 2024 6:27AM
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