Add simple SQL comparison

README.md

@@ -41,7 +41,6 @@ ZipponDB uses its own query language, ZipponQL or ZiQL for short. Here are the k
 - `{}` are filters
 - `[]` specify how much and what data
 - `()` contain new or updated data (not already in the file)
-- `||` are additional options
 
 ## GRAB
 
@@ -87,6 +86,51 @@ Here, we update the first 5 `User` entities named 'bob' to capitalize the name a
 UPDATE User [5] {name='bob'} TO (name = 'Bob')
 ```
 
+## Vs SQL
+
+```sql
+SELECT * FROM User
+```
+
+```
+GRAB User
+```
+
+```sql
+SELECT *
+FROM your_table_name
+WHERE name = 'Bob'
+AND (age > 30 OR age < 10);
+```
+
+```
+GRAB User {name = 'Bob' AND (age > 30 OR age < 10)}
+```
+
+```sql
+SELECT u1.name AS user_name, GROUP_CONCAT(u2.name || ' (' || u2.age || ')') AS friends_list
+FROM User u1
+LEFT JOIN User u2 ON ',' || u1.friends || ',' LIKE '%,' || u2.id || ',%'
+WHERE u1.age > 30
+GROUP BY u1.name;
+```
+
+```
+GRAB User [name, friends [name, age]] {age > 30}
+```
+
+```sql
+SELECT u1.name AS user_name, GROUP_CONCAT(u2.name || ' (' || u2.age || ')') AS friends_list
+FROM User u1
+LEFT JOIN User u2 ON ',' || u1.friends || ',' LIKE '%,' || u2.id || ',%'
+WHERE u2.age > 30
+GROUP BY u1.name;
+```
+
+```
+GRAB User [name, friends [name, age] {age > 30}]
+```
+
 ## Link query - Not yet implemented
 
 You can also link query. Each query returns a list of UUID of a specific struct. You can use it in the next query.