Added ILIKE part. (#21705)

guide/english/sql/sql-like-operator/index.md

@@ -6,6 +6,14 @@ title: SQL LIKE Operator
 ### LIKE Operator defined
 The `LIKE` operator is used in a `WHERE` or `HAVING` (as part of the `GROUP BY`) to limit the selected rows to the items when a column has a certain pattern of characters contained in it. 
 
+### ILIKE Opeartor 
+The 'ILIKE' works same as 'LIKE' but it ignores case-sensitivity in the string. The provided pattern string should be the case-sensitive else you will get an error. To avoid these errors, just write `ILIKE` instead of `LIKE`.
+For Example,
+```sql
+FullName LIKE 'monique%'                   // --you will face error because the name saved in Database is 'Monique'.
+FullName ILIKE 'monique%'                  // --you will not see any error now.
+```
+
 ### This guide will demonstrate:
 * Determining if a string starts or ends with a given string pattern
 * Determining if a pattern exists in the middle of the string