I want to select the value before and after the comma - sql

Question

Sql Query for select the value before and after the comma
There is a table called employee, there is 3 fields..Id,Name,Departmentid
In DepartmentId it consist of 3 id 201,301,401.
From this want to execute
Select * from employee where DepartmentId =301

Answer 1

This will work if you're always looking to match on the number in the middle, e.g. 301 in your example.
SELECT *
FROM employee
WHERE
SUBSTRING (
DepartmentId,
CHARINDEX(',', DepartmentId, 0) + 1,
CHARINDEX(',', DepartmentId, CHARINDEX(',', DepartmentId, 0) + 1) - CHARINDEX(',', DepartmentId, 0) - 1
) = '301'
If 301 can be in any location in that field then you can just use LIKE
SELECT *
FROM employee
WHERE DepartmentId LIKE '%301%'

Answer 2

SELECT * FROM EMPLOYEE WHERE DEPARTMENTID LIKE '%301%'
Even if it works, I don't really understand how your DB is designed and why you need commas

Answer 3

You can use parsename() function:
. . .
where parsename(replace(DepartmentId, ',', '.'), 2) = 301;
However like predicate also useful:
. . .
where DepartmentId LIKE '%301%';

Answer 4

Comma seperated columns are an antipattern. You want to normalize your departments.
However, here's one way to do it:
select * from employee
where '301' in (SELECT value FROM STRING_SPLIT(department, ','))

Answer 5

If you have departments like 1301 or 3011 then a simple LIKE might fail
Please check following SQL code
select * from employees where ','+departmentid+',' like '%,301,%'
And other option is to split departmentid column into each seperate department id value list
If you have a SQL Server before SQL Server 2016 then you need your own custome SQL string split function.
Then you can use following SQL query
select e.*
from employees as e
cross apply dbo.split(departmentid,',') as s
where s.val = '301'
If you are working on SQL Server 2016 or SQL Server 2017, string_split build-in SQL function can be used as follows again in a CROSS APPLY query
SELECT e.*
FROM employees as e
CROSS APPLY STRING_SPLIT(departmentid, ',')
WHERE value = '301'
One last method can be using SQL XML query by modifying the comma seperated list into an XML data as follows
select
Id, Name, sqlXML.value('.','varchar(5)') as DepId
from (
SELECT
Id, Name,
convert(xml, '<root><t>' + REPLACE(Departmentid, ',', '</t><t>') + '</t></root>') as dlist
FROM employees
) tbl
CROSS APPLY dlist.nodes('/root/t') as XMLData(sqlXML)
WHERE sqlXML.value('.','varchar(5)') = '301'