Question 2A junior data professional notices their Boolean column is incorrectly storing True/False values as strings. What SQL function can the analyst use to convert the data type from a string to Boolean? 1 pointLENGTHCASTSUBSTRTRIM

To convert a string to a Boolean in SQL, the analyst can use the CAST function. Here is a step-by-step explanation:

1. Identify the Column: Determine the name of the column that contains the Boolean values stored as strings. For this example, let's assume the column is named status.

2. Understand the CAST Function: The CAST function in SQL is used to convert a value from one data type to another. The syntax is:

   CAST(expression AS target_data_type)
   

3. Write the SQL Query: Use the CAST function to convert the string values to Boolean. Assuming the table name is my_table, the query would look like this:

   SELECT 
       CAST(status AS BOOLEAN) AS status_boolean
   FROM 
       my_table;
   

4. Update the Table (if needed): If you need to update the table to permanently change the data type of the column, you might need to create a new column with the correct data type and then populate it with the converted values. Here’s an example:

   ALTER TABLE my_table ADD COLUMN status_boolean BOOLEAN;
   
   UPDATE my_table
   SET status_boolean = CAST(status AS BOOLEAN);
   

5. Verify the Conversion: After running the update, you can verify that the values have been correctly converted by selecting the new column:

   SELECT status, status_boolean FROM my_table;
   

In summary, the SQL function the analyst can use to convert the data type from a string to Boolean is CAST.