create table call_req(

[persid] [nvarchar](30) NULL,
[ref_num] [nvarchar](30) NOT NULL,
[type] [nvarchar](10) NULL,
);

Insert into call_req (persid,ref_num,type)
VALUES ('cr:400002',23,'I')
Insert into call_req (persid,ref_num,type)
VALUES ('cr:400051',24,'I')