1.下列sql符合规范的是
A select name, code from table where id = 1
B select user_name, user_code from table where id = 1
C CREATE TABLE table ( `select` int )
D select userName from table where id = 1
2.下面字段定义符合规范的是
A `price` float(20) NOT NULL COMMENT '价格，单位元'
B `price` bigint(20) NOT NULL DEFAULT '0' COMMENT '价格，单位分'
C CREATE TABLE table (col int) ENGINE=InnoDB
D `create_time` datetime COMMENT '创建时间'
3.下面SQL符合规范的是
A select order_id from ORDER where status != 0
B select user_name from table where id = '1'
C select c_id,user_name from table where user_name like '%test%'
D select user_name from table where id > 100000 limit 10
4.下面的操作符合业务要求的是题目
A select * from table where order_id = 1;
B alter table XX drop column name
C update table set status = 1 where id =1
D delete from table where id =1
5.【多选题】下列索引定义不符合规范的是
A uniq_order_id
B idx_user_id
C user_id_order_id
D idx_a_b_c_d_e_f
6.下面的SQL符合规范的是
A select * from table where id in (...........); 有1000个
B select count(id) from table where id > 100
C select * from table where id not in (1,2,3,100,200)
D select id,user_name,address from table where user_name like 'test%'
7.下面哪个SQL的实现较优是
A select user_name,address from table where user_name=xx order by id asc limit 100000, 20;
B select id from table where substring(user_name,1,3)='abc';
C SELECT COUNT(*) FROM table where id < 100;
D select table_name_one.user_name from (table_name_one, table_name_two) join table_name_two on table_name_one.id=table_name_two.id where table_name_one.id=1;
8.如Order表中有a、b、c三个字段，联合索引建立如下 idx_a_b_c 下面SQL 哪些不能命中索引多选
【多选题】【中】（10分）
A select order_id from ORDER where b ='xxx';
B select order_id from ORDER where b ='xxx' and c = 'xxx';
C select order_id from ORDER where a = 'xxx';
D select order_id from ORDER where a = 'xxx' and b ='xxx';
E select order_id from ORDER where b ='xxx' and a = 'xxx';
F select order_id from ORDER where a = 'xxx' and b ='xxx' and c = 'xxx';
考生本题得分：0.0分
9.如Order表中有a、b、c三个字段，联合索引建立如下 idx_a_b_c 对于select order_id from ORDER where a = 'xxx' and b > 'xxx' order by c 下列说法正确的是
【单选题】【中】（10分）
A 不能命中索引
B 可以命中a_b_c
C 可以命中a_b
D 可以命中a
考生本题得分：10.0分
10.如Order表中有a、b、c三个字段，联合索引建立如下 idx_a_b_c 对于select order_id from ORDER where a = 'xxx' and b = 'xxx' order by c 下列说法正确的是
【单选题】【中】（10分）
A 不能命中索引
B 可以命中a_b_c
C 可以命中a_b
D 可以命中a
答案：
1-5：B B D C CD
6-10：D C AB C B
2:正例：DATETIME(3)