Comparison of common SQL Server and Oracle Functions

Source: Internet
Author: User

Comparison of common SQL Server and Oracle Functions

 

Procedure Pro_SubPro
(
Dw_in in varchar2,
Cur out pkg_general.ROW_CURSOR
)
As
Begin
Open cur
Select yqmc from fle80 where dwbm = dw_in;
End Pro_SubPro;

Procedure Pro_MainPro (
Dw_in in varchar2
)
As
Mc NVARCHAR2 (20 );
Cur pkg_general.ROW_CURSOR;
Begin
Pro_SubPro (dw_in, cur );
Fetch cur into mc;
Loop
Exit when cur % notfound;
Dbms_output.put_line (mc );
Fetch cur into mc;
End loop;
End Pro_MainPro; mathematical functions
In oracle, only one distinct keyword can be displayed for the same record
1. Absolute Value
S: select abs (-1) value
O: select abs (-1) value from dual

2. INTEGER (large)
S: select ceiling (-1.001) value
O: select ceil (-1.001) value from dual

3. Round (small)
S: select floor (-1.001) value
O: select floor (-1.001) value from dual

4. Round (truncation)
S: select cast (-1.002 as int) value
O: select trunc (-1.002) value from dual

5. Rounding
S: select round (1.23456, 4) value 1.23460
O: select round (1.23456, 4) value from dual 1.2346

6. e is the base power
S: select Exp (1) value 2.7182818284590451
O: select Exp (1) value from dual 2.71828182

7. Take the base logarithm of e.
S: select log (1, 2.7182818284590451) value 1
O: select ln (2.7182818284590451) value from dual; 1

8. Use 10 as the base logarithm.
S: select log10 (10) value 1
O: select log (10, 10) value from dual; 1

9. Square
S: select SQUARE (4) value 16
O: select power (4, 2) value from dual 16

10. Take the square root
S: select SQRT (4) value 2
O: select SQRT (4) value from dual 2

11. Evaluate the base power of any number
S: select power (3, 4) value 81
O: select power (3, 4) value from dual 81

12. Random Number acquisition
S: select rand () value
O: select sys. dbms_random.value (0, 1) value from dual;

13. Get the symbol
S: select sign (-8) value-1
O: select sign (-8) value from dual-1

14. Circumference Rate
S: select pi () value 3.1415926535897931
O: Unknown

15. sin, cos, and tan parameters are in radians.
For example, select sin (PI ()/2) value to get 1 (SQLServer)

16. Asin, Acos, Atan, Atan2 return radians

17. radian angle Interchange (, Oracle unknown)
DEGREES: Radian-> Angle
RADIANS: Angle-> radian

Comparison between values

18. Calculate the maximum value of the Set
S: select max (value) value from
(Select 1 value
Union
Select-2 value
Union
Select 4 value
Union
Select 3 value)

O: select greatest (1,-2, 4, 3) value from dual

19. Minimum value of the Set
S: select min (value) value from
(Select 1 value
Union
Select-2 value
Union
Select 4 value
Union
Select 3 value)

O: select least (1,-2, 4, 3) value from dual

20. How to Handle null values (replace null with 10 in F2)
S: select F1, IsNull (F2, 10) value from Tbl
O: select F1, nvl (F2, 10) value from Tbl

21. Search for the character serial number
S: select ascii ('A') value
O: select ascii ('A') value from dual

22. calculate characters from the serial number
S: select char (97) value
O: select chr (97) value from dual

23. Connection
S: select '11' + '22' + '33' value
O: select CONCAT ('11', '22') 33 value from dual

23. substring position -- return 3
S: select CHARINDEX ('s ', 'sdsq', 2) value
O: select INSTR ('sdsq', 's', 2) value from dual

23. Position of the fuzzy substring -- 2 is returned. If % is removed from the parameter, 7 is returned.
S: select patindex ('% d % q %', 'sdsfasdqe ') value
O: no oracle found, but instr can use the fourth parameter to control the number of occurrences.
Select INSTR ('sdsfasdqe ', 'sd', 1, 2) value from dual returns 6

24. Seek substrings
S: select substring ('abcd', 2, 2) value
O: select substr ('abc', 2, 2) value from dual

25. Return aijklmnef as a substring
S: select stuff ('abcdef', 2, 3, 'ijklmn ') value
O: SELECT Replace ('abcdef', 'bcd', 'ijklmn ') value from dual

26. replace all substrings
S: No
O: select Translate ('fasdbfasegas', 'fa ', 'my') value from dual

27. Length
S: len, datalength
O: length
28. case-insensitive lower, upper

29. uppercase letters
S: No
O: select INITCAP ('abcd dsaf df') value from dual

30. Left fill space (the first parameter of LPAD is space, which is the same as the space function)
S: select space (10) + 'abc' value
O: select LPAD ('abc', 14) value from dual

31. Right fill space (the first parameter of RPAD is space, which is the same as the space function)
S: select 'abc' + space (10) value
O: select RPAD ('abcd', 14) value from dual

32. Delete Spaces
S: ltrim, rtrim
O: ltrim, rtrim, trim

33. Duplicate string

Related Article

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.