Select command using like condition

Question

How to use select statement using like condition by passing a column from another table?

My query

SELECT count(1)
FROM COMPANYNAME_RESTRICT_LIST a,itaukei_data_store_key b 
WHERE 
   b.surname LIKE a.company_name%  OR 
   b.surname LIKE %a.company_name% OR
   b.surname LIKE %a.company_name% OR
   b.surname LIKE a.company_name%;

Answer 1

This Works Fine.

SELECT * 
FROM COMPANYNAME_RESTRICT_LIST a,itaukei_data_store_key b 
WHERE b.surname LIKE '%'||a.company_name||'%' or 
    b.surname LIKE '%'||a.company_name or 
    b.surname LIKE a.company_name||'%' or 
    b.surname LIKE a.company_name;

Answer 2

concatenation: +'%'

SELECT 
  count(1) 
FROM 
  COMPANYNAME_RESTRICT_LIST a,
  itaukei_data_store_key b 
WHERE       
  b.surname LIKE '%'+a.company_name+'%'

Answer 3

The standard SQL function is concat():

SELECT count(1)
FROM COMPANYNAME_RESTRICT_LIST a join
     itaukei_data_store_key b 
     on b.surname like concat('%', a.company_name, '%')

Not all databases support concat(). So, one of the following will also generally work:

     on b.surname like '%' || a.company_name || '%'
     on b.surname like '%' + a.company_name + '%'
     on b.surname like '%' & a.company_name & '%'