a$.$

$$SELECT $*$ FROM books

WHERE pubid IN $(1,2)$ OR retail $=>42$;

b$.$

$$SELECT $*$ FROM books

WHERE pubid $=1$ OR pubid $=2$ OR retail $>=42$;

c$.$

$$SELECT $*$ FROM books

WHERE pubid $=1$ AND pubid$=2$ OR retail $>=42$;

d$.$

$$both a and b

a$.$

$$search patterns

b$.$

$$comparison operators

c$.$

$$arithmetic operations

d$.$

$$logical operators