Question

"Which ON clause has valid qualifying syntax?

a. from empsau inner join phonec
on = ;
b. from empsau inner join phonec
on = ;
c. from empsau inner join phonec
on = ;
d. from empsau inner join phonec
on = ;

Answer 1

The question asks for a valid SQL ON clause syntax for an INNER JOIN. The correct ON clause should match a column from the first table with a corresponding column in the second table, typically using an equality comparison.

Step-by-step explanation:

The question primarily deals with SQL JOIN syntax, particularly the ON clause. The ON clause is used to specify the conditions that dictate how two tables are to be joined in a query. A proper ON clause includes the key columns from both tables that will be compared to perform the join. An example of a valid syntax would be:

FROM empsau INNER JOIN phonec ON empsau.id = phonec.emp_id;

This assumes 'empsau' and 'phonec' are the table names and 'id' and 'emp_id' are the column names used to join the two tables, where 'empsau.id' matches 'phonec.emp_id'. Without the correct column names, the query is incomplete and will result in an error.