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1.¾ø¶ÔÖµ
S:select abs(-1) value
O:select abs(-1) value from dual
 
2.È¡Õû(´ó)
S:select ceiling(-1.001) value
O:select ceil(-1.001) value from dual
 
3.È¡Õû£¨Ð¡£©
S:select floor(-1.001) value
O:select floor(-1.001) value from dual
 
4.È¡Õû£¨½ØÈ¡£©
S:select cast(-1.002 as int) value
O:select trunc(-1.002) value from dual
 
5.ËÄÉáÎåÈë
S:select round(1.23456,4) value 1.23460
O:select round(1.23456,4) value from dual 1.2346
 
6.eΪµ×µÄÃÝ
S:select Exp(1) value 2.7182818284590451
O:select Exp(1) value from dual 2.71828182
 
7.È¡eΪµ×µÄ¶ÔÊý
S:select log(2.7182818284590451) value 1
O:select ln(2.7182818284590451) value from dual; 1
 
8.È¡10Ϊµ×¶ÔÊý
S:select log10(10) value 1
O:select log(10,10) value from dual; 1
 
9.ȡƽ·½
S:select SQUARE(4) value 16
O:select power(4,2) value from dual 16
 
10.ȡƽ·½¸ù
S:select SQRT(4) value 2
O:select SQRT(4) value from dual 2
 
11.ÇóÈÎÒâÊýΪµ×µÄÃÝ
S:select power(3,4) value 81
O:select power(3,4) value from dual 81
 
12.È¡Ëæ»úÊý
S:select rand() value
O:select sys.dbms_random.value(0,1) value from dual;
 
13.È¡·ûºÅ
S:select sign(-8) value -1
O:select sign(-8) value from dual -1
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14.Ô²ÖÜÂÊ
S:SELECT PI() value 3.1415926535897931
O:²»ÖªµÀ
 
15.sin,cos,tan ²ÎÊý¶¼ÒÔ»¡¶ÈΪµ¥Î»
ÀýÈ磺select sin(PI()/2) value µÃµ½1£¨SQLServer£©
 
16.Asin,Acos,Atan,Atan2 ·µ»Ø»¡¶È
 
17.»¡¶È½Ç¶È»¥»»(SQLServer£¬Oracle²»ÖªµÀ)
DEGREES£º»¡¶È-¡µ½Ç¶È
RADIANS£º½Ç¶È-¡µ»¡¶È
 
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18. Ç󼯺Ï×î´óÖµ
S:select max(value) value from
(select 1 value
union
select -2 value
union
select 4 value
union
select 3 value)a
 
O:select greatest(1,-2,4,3) value from dual
 
19. Ç󼯺Ï×îСֵ
S:select min(value) value from
(select 1 value
union
select -2 value
union
select