一、关系运算:
1. 等值比较: =
举例:Hive>select 1 from lxw_dual where 1=1;
2. 不等值比较: <>
举例: hive>select1 from lxw_dual where 1 <> 2;
3.小于比较: <
举例:hive> select1 from lxw_dual where 1 < 2;
4. 小于等于比较: <=
举例: hive>select1 from lxw_dual where 1 <= 1;
5. 大于比较: >
举例:hive> select1 from lxw_dual where 2 >1;
6. 大于等于比较: >=
举例: hive>select1 from lxw_dual where 1 >= 1;
7. 空值判断: IS NULL
举例: hive>select1 from lxw_dual where null is null;
8. 非空判断: IS NOT NULL
举例:hive> select1 from lxw_dual where 1 isnot null;
9. LIKE比较: LIKE
举例:hive> select1 from lxw_dual where 'football' like 'foot%';
10. JAVA的LIKE操作: RLIKE
举例:hive> select1 from lxw_dual where 'footbar’ rlike '^f.*r$’;
11. REGEXP操作: REGEXP
举例:hive> select1 from lxw_dual where 'footbar' REGEXP '^f.*r$';
二、数学运算:
1. 加法操作: +
举例:hive> select1 + 9 from lxw_dual;
2. 减法操作: -
举例:hive> select10 – 5 from lxw_dual;
3. 乘法操作: *
举例: hive>select40 * 5 from lxw_dual;
4. 除法操作: /
举例:hive> select40 / 5 from lxw_dual;
5. 取余操作: %
举例:hive> select 41 % 5 from lxw_dual;
6. 位与操作: &
举例:hive> select 4 & 8 from lxw_dual;
7. 位或操作: |
举例:hive> select 4 | 8 from lxw_dual;
8. 位异或操作: ^
举例:hive> select 4 ^ 8 from lxw_dual;
9.位取反操作: ~
举例:hive> select ~6 from lxw_dual;
三、逻辑运算:
1. 逻辑与操作: AND
举例:hive> select 1 from lxw_dual where 1=1and 2=2;
2. 逻辑或操作: OR
举例:hive> select 1 from lxw_dual where 1=2or 2=2;
3. 逻辑非操作: NOT
举例:hive> select 1 from lxw_dual where not1=2;
四、数值计算
1. 取整函数: round
举例:hive> select round(3.1415926) fromlxw_dual;
2. 指定精度取整函数: round
举例:hive> select round(3.1415926,4) fromlxw_dual;
3. 向下取整函数: floor
举例:hive> select floor(3.1415926) fromlxw_dual;
4. 向上取整函数: ceil
举例:hive> select ceil(3.1415926) fromlxw_dual;
5. 向上取整函数: ceiling
举例:hive> select ceiling(3.1415926) fromlxw_dual;
五、日期函数
1. UNIX时间戳转日期函数:from_unixtime
举例:hive> select from_unixtime(1323308943,'yyyyMMdd')fromlxw_dual;
2. 获取当前UNIX时间戳函数:unix_timestamp
举例:hive> select unix_timestamp() fromlxw_dual;
3. 日期转UNIX时间戳函数:unix_timestamp
举例:hive> select unix_timestamp('2011-12-0713:01:03') from lxw_dual;
4. 指定格式日期转UNIX时间戳函数:unix_timestamp
举例:hive> select unix_timestamp('2011120713:01:03','yyyyMMddHH:mm:ss') from lxw_dual;
5. 日期时间转日期函数:to_date
举例:hive> select to_date('2011-12-0810:03:01') from lxw_dual;
6. 日期转年函数: year
举例:hive> select year('2011-12-08 10:03:01')from lxw_dual;
六、条件函数
1. If函数: if
举例:select if(1=1,100,200) from lxw_dual;
2. 非空查找函数: COALESCE
举例:hive> select COALESCE(null,'100','50′) from lxw_dual;
3. 条件判断函数:CASE
举例: Select case 100 when 50 then 'tom' when 100then 'mary'else 'tim' end from lxw_dual;
4. 条件判断函数:CASE
举例:select case when 1=1 then 'tom' when 2=2then 'mary' else'tim' end from lxw_dual;
七、字符串函数
1. 字符串长度函数:length
举例:hive> select length('abcedfg') fromlxw_dual;
2. 字符串反转函数:reverse
举例:hive> select reverse(abcedfg’) from lxw_dual;
3. 字符串连接函数:concat
举例:hive> select concat(“abc”,”def”,”gh”)from lxw_dual;
4. 带分隔符字符串连接函数:concat_ws(可以聚合数组)
举例:hive> selectconcat_ws(',','abc','def','gh') from lxw_dual;
5. 字符串截取函数:substr,substring
举例:hive> select substr('abcde',3) fromlxw_dual;
6. 字符串截取函数:substr,substring
举例:hive> select substr('abcde',3,2) fromlxw_dual;
八、集合统计函数
1. 个数统计函数: count
举例:hive> select count(*) from lxw_dual;
2. 总和统计函数: sum
举例:hive> select sum(t) from lxw_dual;
3. 平均值统计函数: avg
举例:hive> select avg (distinct t) fromlxw_dual;
九、复合类型构建操作
1. Map类型构建: map
举例:hive> Create table lxw_test as selectmap('100','tom','200','mary')as t from lxw_dual;
2. Struct类型构建: struct
举例:hive> create table lxw_test as select struct('tom','mary','tim')ast from lxw_dual;
3. array类型构建: array
举例:hive> create table lxw_test asselectarray("tom","mary","tim") as t fromlxw_dual;
十、复杂类型访问操作
1. array类型访问: A[n]
举例:hive> create table lxw_test asselectarray("tom","mary","tim") as t fromlxw_dual;
2. map类型访问: M[key]
举例:hive> Create table lxw_test asselectmap('100','tom','200','mary') as t from lxw_dual;
3. struct类型访问: S.x
举例:hive> create table lxw_test as selectstruct('tom','mary','tim')as t from lxw_dual;
十一、复杂类型长度统计函数
1. Map类型长度函数:size(Map)
举例:hive> select size(map('100','tom','101','mary'))
from lxw_dual;
2. array类型长度函数:size(Array)
举例:hive> selectsize(array('100','101','102','103')) from lxw_dual;
3. 类型转换函数
举例:hive> select cast(1 as bigint) fromlxw_dual;