The following SQL is which type of join:SELECT CUSTOMER_T.CUSTOMER_ID, ORDER_T.CUSTOMER_ID, NAME, ORDER_IDFROM CUSTOMER_T, ORDER_TWHERE CUSTOMER_T.CUSTOMER_ID = ORDER_T.CUSTOMER_IDINNER JOINCROSS JOINSELF JOINOUTER JOIN
Question
The following SQL is which type of join:SELECT CUSTOMER_T.CUSTOMER_ID, ORDER_T.CUSTOMER_ID, NAME, ORDER_IDFROM CUSTOMER_T, ORDER_TWHERE CUSTOMER_T.CUSTOMER_ID = ORDER_T.CUSTOMER_IDINNER JOINCROSS JOINSELF JOINOUTER JOIN
Solution
The SQL query you provided is an example of an "INNER JOIN".
However, it's important to note that the syntax is not correctly written for modern SQL standards. The "INNER JOIN" keyword is not used in the correct place. A more correct version of this query using explicit INNER JOIN syntax would look like this:
SELECT CUSTOMER_T.CUSTOMER_ID, ORDER_T.CUSTOMER_ID, NAME, ORDER_ID
FROM CUSTOMER_T
INNER JOIN ORDER_T
ON CUSTOMER_T.CUSTOMER_ID = ORDER_T.CUSTOMER_ID
In your original query, the join is actually being performed by the WHERE clause, which is an older way of writing SQL joins that is generally less clear than the explicit JOIN syntax.
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