Sql update issue with single quotes in the middle.

Hi Guys ,

I have this code for updating data into the Link column.

UPDATE "PROCESS_FULL"."MATERIAL_EVENT_COPY"

SET

LINK ='/CLIENT_DEPLOYMENT_COPY/$format=json&$filter=DOC_CATEGORY eq 'J'&$select=DOC_CATEGORY,PROCESSING_STATUS_DOC_ITEM,ERDAT,ERDAT_ST,PERC'

WHERE

EVENT_DETAIL=' No. of delivery documents for given period'

LINK is of nvarchar type. Bcoz of  value of 'J' (underlined)I am getting syntax error.When I remove the quotes i get No error

I have to put the value as like it is without any change in the link value.

Kindly suggest me how to resolve this issue.