Merge branch 'docs-v2' into 'main'

docs: add example query

See merge request x433485/minisql!24

README.md

@@ -70,6 +70,11 @@ To exit the REPL client, enter `exit` or `quit`.
 CREATE TABLE <TableName> (<ColumnName> <DataType>, ...);
 ```
 
+With the demo database, this can be used to create a new table:
+```sql
+CREATE TABLE games (id UUID PRIMARY KEY, name STRING, year INT, price NUMBER);
+```
+
 ### `CREATE INDEX`
 - Indexing is not supported for the `NUMBER` data type
 
@@ -77,6 +82,11 @@ CREATE TABLE <TableName> (<ColumnName> <DataType>, ...);
 CREATE INDEX <IndexName> ON <TableName> (<ColumnName>);
 ```
 
+With the demo database, this can be used to create a new index:
+```sql
+CREATE INDEX CarsYear ON cars (year);
+```
+
 ### `SELECT`
 - `WHERE` clause is optional and only equality is supported
 - All columns can be selected with `*`
@@ -85,12 +95,23 @@ CREATE INDEX <IndexName> ON <TableName> (<ColumnName>);
 SELECT <ColumnName>, ... FROM <TableName> [WHERE <ColumnName> = <Value>];
 ```
 
+With the demo database, this can be used to select all cars with year 2001:
+```sql
+SELECT * FROM cars WHERE year = 2001;
+```
+
 ### `INSERT`
 
 ```sql
 INSERT INTO <TableName> (<ColumnName>, ...) VALUES (<Value>, ...);
 ```
 
+With the demo database, this can be used to insert a new user:
+```sql
+INSERT INTO users (id, name, surname, email) VALUES (u12345, "John", "Doe", "johhny.trucker@seznam.cz");
+```
+
+
 ### `DELETE`
 - `WHERE` clause is optional and only equality is supported
 
@@ -98,6 +119,11 @@ INSERT INTO <TableName> (<ColumnName>, ...) VALUES (<Value>, ...);
 DELETE FROM <TableName> [WHERE <ColumnName> = <Value>];
 ```
 
+With the demo database, this can be used to delete all users with name Christina:
+```sql
+DELETE FROM users WHERE name = "Christina";
+```
+
 ## Data Types
 - `UUID` - special integer prefixed with `u`, e.g. `u12345`
 - `STRING` - string enclosed in double quotes, e.g. `"Hello World"`