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Creating a Model

To create a model, use the CREATE MODEL statement. 
CREATE MODEL mindsdb.home_rentals
FROM example_db
    (SELECT * FROM demo_data.home_rentals)
PREDICT rental_price
USING engine = 'lightwood',
      tag = 'my model';
Now, your model has one version. You can verify by querying the models_versions table. 
SELECT *
FROM mindsdb.models_versions
WHERE name = 'home_rentals';
On execution, we get: 
+------------+-------+------+-------+--------+--------+------------+-------------+---------------+------+------------------------------------+---------------------------------------+--------+
|NAME        |PROJECT|ACTIVE|VERSION|STATUS  |ACCURACY|PREDICT     |UPDATE_STATUS|MINDSDB_VERSION|ERROR |SELECT_DATA_QUERY                   |TRAINING_OPTIONS                       |TAG     |
+------------+-------+------+-------+--------+--------+------------+-------------+---------------+------+------------------------------------+---------------------------------------+--------+
|home_rentals|mindsdb|true  |1      |complete|0.999   |rental_price|up_to_date   |22.11.3.2      |[NULL]|SELECT * FROM demo_data.home_rentals|{'target': 'rental_price', 'using': {}}|my model|
+------------+-------+------+-------+--------+--------+------------+-------------+---------------+------+------------------------------------+---------------------------------------+--------+

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Retraining a Model

To retrain a model, use the RETRAIN statement. 
RETRAIN mindsdb.home_rentals;
Let’s query for the model versions again. 
SELECT *
FROM mindsdb.models_versions
WHERE name = 'home_rentals';
On execution, we get: 
+------------+-------+------+-------+--------+--------+------------+-------------+---------------+------+------------------------------------+---------------------------------------+--------+
|NAME        |PROJECT|ACTIVE|VERSION|STATUS  |ACCURACY|PREDICT     |UPDATE_STATUS|MINDSDB_VERSION|ERROR |SELECT_DATA_QUERY                   |TRAINING_OPTIONS                       |TAG     |
+------------+-------+------+-------+--------+--------+------------+-------------+---------------+------+------------------------------------+---------------------------------------+--------+
|home_rentals|mindsdb|false |1      |complete|0.999   |rental_price|up_to_date   |22.11.3.2      |[NULL]|SELECT * FROM demo_data.home_rentals|{'target': 'rental_price', 'using': {}}|my model|
|home_rentals|mindsdb|true  |2      |complete|0.999   |rental_price|up_to_date   |22.11.3.2      |[NULL]|SELECT * FROM demo_data.home_rentals|{'target': 'rental_price', 'using': {}}|my model|
+------------+-------+------+-------+--------+--------+------------+-------------+---------------+------+------------------------------------+---------------------------------------+--------+

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Using Active Model Version

To use the currently active model version, run this query: 
SELECT *
FROM mindsdb.home_rentals AS p
JOIN example_db.demo_data.home_rentals AS d;

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Using Specific Model Version

To use a specific model version, even if it is set to inactive, run this query: 
SELECT *
FROM mindsdb.home_rentals.1 AS p
JOIN example_db.demo_data.home_rentals AS d;

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Setting Model Version as Active

To set a specific model version as active, run the UPDATE statement: 
UPDATE mindsdb.models_versions
SET active = 1
WHERE version = 1
AND name = 'home_rentals';

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Deleting Specific Model Version

To delete a specific model version, run the DELETE FROM statement: 
DELETE FROM mindsdb.models_versions
WHERE version = 2
AND name = 'home_rentals';
Please note that you cannot delete the version that is active.

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Deleting All Model Versions

To delete all models version, run the DROP MODEL statement: 
DROP MODEL mindsdb.home_rentals;