oracle analytic functions

Tags: aggregation statistics HTTPS GROUP by has a WWW false log packet1, Row_number () over () sorting function:(1) Row_number () over () Grouping sorting function:When using the Row_number () over () function, the grouping in over () and the execution of the sort are later than the where group by order by.Partition by is used to group the result set, and if it is not specified then it takes the entire result set as a grouping, which differs from the aggregation function in that it can return mu

Single-record functions in SQL1. ASCIIReturns the decimal number corresponding to the specified character;SQL> select ascii ('A') A, ascii ('A') A, ascii ('0') zero, ascii ('') space from dual;A ZERO SPACE------------------------------------65 97 48 322. CHRReturns the corresponding characters;SQL> select chr (54740) zhao, chr (65) chr65 from dual;ZH C---Zhao3. CONCATConnect two strings;SQL> select concat ('010-', '000000') |' to 23' Gao Qian competin

Keywords: Oracle numeric function-type date conversion To_char automatic type conversion Date type numeric converter other function numeric functionABS: Find the absolute value function, such as: ABS (−5) 5SQRT: square root function, such as: sqrt (2) 1.41421356Power: exponentiation function, such as: 2,3 8COS: cosine trigonometric functions, such as: cos (3.14159) −1MoD: Find division remainder, such as mo

information technology Select Replace (deptno, ' 01 ', ' information technology ') from users; Use the Age field in the Employee Information table with 10 to select mod (age,10) from users; Year of entry of employee: Select Extract (from RegDate) from users; Find employee information for May entry select * from Users where extract (month from regdate) = 5; Copyright NOTICE: This article for Bo Master original article, without Bo Master permission not reproduced. Numerical

Oracle date functions/character functions/numeric functions/conversion functions/Aggregate functions Oracle date functions: [SQL] MONTHS_BET

Oracle date functions: Months_between: returns the difference of the month between two dates months_between ('01-EP-95 ', '11-Jan-94') ==> 19.6774194 add_months: Number of copies added to the date. add_months ('11-Jan-94 ', 6) ==> '11-JUL-94' next_day: Specifies the day after the date. next_day ('01-SEP-95 ', 'Friday') ==> '08-SEP-95' last_day: the last day of the month. last_day ('01-SEP-95) ==> '30-SEP-9

Single record function in SQL 1. ASCII returns the decimal number corresponding to the specified character; SQLselectascii (A) A, ascii (a) a, ascii (0) zero, ascii () spacefromdual; The AAZEROSPACE------------------------------------659748322.CHR gives the integer, returns the corresponding character; SQLselect Single record function in SQL 1. ASCII returns the decimal number corresponding to the specified character. SQL select ascii (A) A, ascii (a) a, ascii (0) zero, ascii () space from dual;

Common Oracle functions-character and mathematical functions, oracle mathematical functions Various functions are often used in the development and use of oracle. This chapter summarize

Common Oracle functions-date functions, oracle date functions In the development and use of oracle, a variety of date functions are often used. The online date

to 0)1 Sample:2 Select round(123.456,0) fromDual Return123 3 Select round(123.456,1) fromDual Return123.5 4 Select round(-123.456,2) fromDual Return-123.46 3.ceil and Floor functionsThe ceil and floor functions are sometimes useful when it comes to business data. Ceil (n) takes the smallest integer greater than or equal to the value N, and Floor (N) takes the largest integer less than or equal to the value N; turn from: http://www.2cto.com/database/2

--------------------------------------------------------------------------------Oracle. World typ = 1 Len = 12 characterset = zhs16gbk: W, O, R, L, d 54. empty_blob () and empty_clob ()Both functions are used to initialize fields of the big data type. 55. GreatestReturns the maximum value in a group of expressions, that is, compare the encoding size of characters.SQL> select greatest ('A', 'AB', 'ac') from

Single-record functions in SQL 1. ASCIIReturns the decimal number corresponding to the specified character;SQL> select ascii ('A') A, ascii ('A') A, ascii ('0') zero, ascii ('') space from dual;A ZERO SPACE------------------------------------65 97 48 322. CHRReturns the corresponding characters;SQL> select chr (54740) zhao, chr (65) chr65 from dual;ZH C---Zhao3. CONCATConnect two strings;SQL> select concat ('010-', '000000') |' to 23' Gao Qian competi

This article is not ready to introduce all of the Oracle functions, in the current situation, I do not have this time, need to learn too much, to spend most of the time on learning to use the technical aspects:), so if you are ready to learn all the Oracle functions of friends, or to focus on:

the right of the decimal point. The default value of N2 is 0, if N2 is a negative number, it is rounded to the corresponding digit on the left of the decimal point (although the N2 value mentioned in Oracle documents must be an integer, in fact, the judgment here is not rigorous, even if N2 is not an integer, it will also automatically perform processing after the N2 is rounded up. However, we need to pay special attention to other points that must b