character functions

Oracle 10g Oracle is designed for Grid computing, the G in 10g refers to the grid computing Oracle stores data in files, files that hold different information (data files, control files, log files) make up the physical structure of the database

1. Absolute valueSql:select ABS ( -1) valueO:select ABS ( -1) value from dual2. Rounding (Large)S:select Ceiling ( -1.001) valueO:select ceil ( -1.001) value from dual3. Rounding (small)S:select Floor ( -1.001) valueO:select Floor ( -1.001) value

--1. Character functions--upper (String|column) can turn characters into uppercaseSelect Upper (' Helloword ') from dual;Select Upper (ename) from EMP;--lower (String|column) converts the specified string to lowercaseSelect lower (' Helloword ')

One, character functionsThe character function is the most commonly used function in Oracle, so let's see what the character functions are:Lower (char): converts a string to a lowercase format.Upper (char): converts a string to an uppercase

Learning Oracle also for some time, found that the functions of Oracle many, for the background of the program ape, a lot of time to learn many other new things, and then remember these functions are not very realistic, so summed up some of Oracle's

① in SQL is not equal to using <>eg:select * from EMP where Deptno <>10;The ① fuzzy match keyword is like _ represents a character, and% represents 0 or more. Eg:select ename from emp where ename like ' _a% ';Escape characters in ②sql follow the '

Database Summary Language classification Detailed description 1. Data query Statements Select 2. Data manipulation statements (DML) Insert;Update;Delete; 3. Database definition

One, character functionsCharacter functions accept character arguments, which can be columns in a table or a string expression.Commonly used character functions: Function Description ASCII (X) Returns the ASCII

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Examples of common methods for single-line functions are shown:--[1] character functions--Query the names of all employees in lowercase, uppercase, and uppercase letters--select ename from emp;--lower () lowercase upper () uppercase Initcap () first

One, character functions 1. Casing control function --lower: Make the letter lowercase----upper: Make the letter uppercase----INITCAP: Make the first letter of the character uppercase--select lower (' ABC '), Upper (' sql '), Initcap (' HeLlo

The SELECT statement in SQLSpool d:\ basic query. txt--spool recorded on the screen as a text file--Clear screenHost Clear (Linux)Host CLS (window)--Current userShow user--The table under the current userSELECT * from tab; (tab data dictionary,

a) Date function [focus on the first four date functions]1.add_months[return date plus (minus) The date after the specified month (before)Add_months (D1,N1)"Function": Returns the new date after the date D1, plus N1 months."Parameters": D1, Date

Character functions can be associated with Select,update,deleteRight ()----Select fromSELECT Right from tableLeft ()----Select fromSubstring_index----intercept Partial column values to find everything before the specified character or stringSELECT

--Character functions--1.ASCII returns the decimal number corresponding to the specified character;Select ASCII (' a ') a,ascii (' A ') a,ascii (' 0 ') zero,ascii (") space from dual;--2.CHR gives an integer, returning the corresponding

MySQL built-in functions: Character functions numeric functions Time-Date function Common use of numeric functions:1 Select avg from Tdb_goods; Find the average of field valuesBuilt-in summation functions:1 Select sum from

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I. Oracle COMMON data typesOne, data definition language (DDL)Data definition language is used to alter the database structure, including creating, changing, and deleting database objects.The data definition language commands used to manipulate the

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1 Find the character position function: Strpos ($str, $seach, [int]); Find the first position of search in $str starting with int; Stripos ($str, $seach, [int]); The function returns the position of the first occurrence of the string in another