Which two are true about a SQL statement using SET operators such as UNION? (Choose two.) A. The number, but not names, of columns must be identical for all SELECT statements in the query. B. The data type of each column returned by the second query must exactly match the data type of the corresponding column returned by… Read More »
Which two are true about a SQL statement using SET operators such as UNION? (Choose two.) A. The data type group of each column returned by the second query must match the data type of the corresponding column returned by the first query. B. The names and number of columns must be identical for all SELECT statements in… Read More »
Which two statements are true regarding the UNION and UNION ALL operators? (Choose two.) A. NULLS are not ignored during duplicate checking B. Duplicates are eliminated automatically by the UNION ALL operator C. The names of columns selected in each SELECT statement must be identical D. The number of columns selected in each SELECT statement must be identical… Read More »
Which two are true about a SQL statement using SET operators such as UNION? (Choose two.) A. The names and number of columns must be identical for all SELECT statements in the query. B. The data type of each column returned by the second query must be implicitly convertible to the data type of the corresponding column returned… Read More »