Answer:
Below is the required statement:
Explanation:
select c.categoryname
from categories c
where not exists (select 1 from products p where p.categoryid = c.categoryid);
Answer:
A matrix can only be added to (or subtracted from) another matrix if the two matrices have the same dimensions.
Explanation:
Subtracting matrices Similarly, to subtract matrices, we subtract the corresponding entries. For example, let's consider C = [ 2 8 0 9 ] C=\left[\begin{array}{rr}{2} &8 \\ 0 & 9 \end{array}\right] C=[2089] and D = [ 5 6 11 3 ] D=\left[\begin{array}{rr}{5} &6 \\ 11 & 3 \end{array}\right] D=[51163].
Second one i’m pretty sure
Money market?? i think anyway.
