Row wise data validation correponding column data validation

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i was tried to validate the data in the sqlserver , i want to insert a new row in the table , before inserting the data i have to check the the two cloumns data should not repaeat , if not exists then insert the data , is there any contrsints or funtions in sqlserver

What I have tried:

create table check_con1( name varchar(25),vs varchar(10),vn varchar(10) ,check(vs!=vn))

Posted 4-Nov-20 20:06pm

saagarchary

Updated 5-Nov-20 0:03am

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Sandeep Mewara · Answer 1 · 2020-11-05T00:04:00

Sounds like you are looking for SQL unique constraints (apply them to the two columns you don't want value to be repeated):
SQL UNIQUE Constraint[^]
SQL - UNIQUE Constraint - Tutorialspoint[^]

For example, the following SQL query creates a new table called CUSTOMERS and adds five columns. Here, the AGE column is set to UNIQUE, so that you cannot have two records with the same age.

SQL

CREATE TABLE CUSTOMERS(
   ID   INT              NOT NULL,
   NAME VARCHAR (20)     NOT NULL,
   AGE  INT              NOT NULL UNIQUE,
   ADDRESS  CHAR (25) ,
   SALARY   DECIMAL (18, 2),       
   PRIMARY KEY (ID)
);