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ASCII (str)Returns the ASCII code value of the leftmost character of the string str. If Str is an empty string, returns 0. If STR is NULL, returns NULL.Mysql> Select ASCII (' 2 ');-> 50Mysql> Select ASCII (2);-> 50Mysql> Select ASCII (' DX ');->

MySQL string intercept function: Left (), right (), substring (), Substring_index (). There is also mid (), substr (). where mid (), substr () is equivalent to the substring () function, the function of substring () is very powerful and flexible.1.

PL/SQL single-line functions and group functionsA function is a program that has 0 or more parameters and has a return value. Oracle has built a series of functions in SQL, which can be called SQL or PL/SQL statements, and functions are divided into

Directory:One, the built-in function two, the date time type elaboration three, the internal connection and the outer connection four, the alias five, the storage engine six, the transaction processing seven, the variable eight, the character set

For operations on string positions, the first position is marked as 1. ASCII(str) Returns the str ASCII code value of the leftmost character of the string. If str It is an empty string, return 0 . If

For operations on string positions, the first position is marked as 1. ASCII(str) Returns the str ASCII code value of the leftmost character of the string. If str It is an empty string, return 0 . If

Mathematical functions Serial number function function SQL Server usage Oracle usage 1 Absolute Select ABS ( -1) value Select ABS ( -1) value from dual 2 Rounding (Large)

For operations on string positions, the first position is marked as 1. ASCII (str) Returns the ASCII code value of the leftmost character of the string str. If Str is an empty string, returns 0. If STR is NULL, returns NULL. Mysql> Select ASCII (' 2

Data Transformation Data The SQL sever is strong enough to convert most of the values from one type to another when needed. For example, to compare the size of smallint and int data, you do not need an explicit type conversion. The SQL sever will

MySQL String Function EncyclopediaFor operations on string positions, the first position is marked as 1. ASCII (str) Returns the ASCII code value of the leftmost character of the string str. If Str is an empty string, returns 0. If STR is NULL,

String function ASCIIReturns the ASCII encoding of the first letter of the stringSelect ASCII (' name ')Select ASCII (name) from XueshengSelect *from Xuesheng where ASCII (name) >=200CHAR--Convert the ASCII code to the corresponding characterSelect

Meta-data functions db_idGets the database unique identity, which is the unique identity on the serverGrammatical structure: db_id ([' database_name '])Parameter description: database_name is the database name and is an optional parameter. Returns

In developing T-SQL, it is often necessary to perform a variety of operations on strings, and the following describes commonly used string functions.　　1. ASCII ASCII code to get charactersThe ASCII code is the standard encoding of the character. To

Advanced queries are most frequently used in databases and are also the most widely used. For more information about how to learn sqlserver, see. Advanced queries are most frequently used in databases and are also the most widely used. For more

MySQL string functionsFor operations on the string position, the first position is marked as 1.ASCII (str) Returns the ASCII code value of the leftmost character of the str string. If str is a Null String, 0 is returned. If 'str' is NULL, return

Ø basic common Query-- SelectSelect * from student;-- All query allSelect all sex from student;-- Duplicate distinct FilteringSelect distinct sex from student;-- Count statisticsSelect count (*) from student;Select count (sex) from student;Select

For operations on the string position, the first position is marked as 1.ASCII (str)Returns the ASCII code value of the leftmost character of the str string. If str is a Null String, 0 is returned. If 'str' is NULL, return NULL.Mysql> select ASCII ('

Oracle + 110 common functions 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; A ZERO SPACE ------------------------------------ 65 97 48 32

Oracle built-in function analysis SQL single record function 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; a zero space ---------

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