执行如下SQL运算符代码,并分析结果。 (1)SELECT a,a+5,a*2 FROM t1; (2) SELECT a,a/3,a DIV 3,a%5,MOD(a,5) FROM t1; (3) SELECT a,a=24,a<12,a>40,a>=24,a<=24,a!=24,a<>24,a<=>24 FROM t1; (4) SELECT a,a='24','ha'<>'ha','xa'='xa','b'!='b' FROM t1; (5) SELECT a,a IS NULL, a IS NOT NULL FROM t1; (6) SELECT a,a BETWEEN 15 AND 30,a NOT BETWEEN 15 AND 30 FROM t1; (7) SELECT a,a IN(1,2,23),a IN(24,12,22) FROM t1; (8) SELECT s,s LIKE 'beijing',s LIKE 'b%g',s LIKE 'bei_',s LIKE '%jing' FROM t1; (9) SELECT 2&&2,2&&NULL,2 AND 3,2 AND 2; (10) SELECT 2||2,2||NULL,2 OR 3,2 OR 0; (11) SELECT !1,!2,!NULL;