SELECTname,SUBSTRING(name,1,1)ASInitial,SUBSTRING(name,3,2)ASThirdAndFourthCharactersFROMsys.databasesWHEREdatabase_id <5; 结果集如下。 name初始ThirdAndFourthCharacters mastermst tempdbtmp modelmde msdbmdb 若要显示字符串常量abcdef的第二、第三和第四个字符,请使用以下查询。
SQLGetInfo 會傳回與連接相關聯之驅動程式和數據源的一般資訊。 語法 C++ 複製 SQLRETURN SQLGetInfo( SQLHDBC ConnectionHandle, SQLUSMALLINT InfoType, SQLPOINTER InfoValuePtr, SQLSMALLINT BufferLength, SQLSMALLINT * StringLengthPtr); 引數 ConnectionHandle [輸入] 連線控制代碼。 InfoType [輸入]信息...
ASCII values for extended characters Assign empty string '' if datetime is null Assign EXEC output to Variable Assigning NULL value to column name using Case Statement of where is SQL SERVER 2008 atomic if not exists() and insert or update Attempt to fetch logical page (1:155534) in databas...
in which malicious SQL statements are inserted into an entry field for execution (e.g. to dump the database contents to the attacker).SQL injection must exploit a security vulnerability in an application's software, for example, when user input is either incorrectly filtered for string literal ...
instr(str, substr) - Returns the (1-based) index of the first occurrence ofsubstrinstr. Examples:> SELECT instr('SparkSQL', 'SQL');6 Examples:>SELECT locate('bar', 'foobarbar'); 4 14.space 在字符串前面加n个空格 space(n) - Returns a string consisting ofnspaces. ...
01519 The null value has been assigned to a variable, because a numeric value is out of range. 01520 The null value has been assigned to a variable, because the characters cannot be converted. 01521 A specified server-name is undefined but is not needed until the statement is executed or ...
如果StringLengthPtr 指向的位置中的值大于 BufferLength 中指定的长度,则字符串输出信息将被截断为 BufferLength 字节,函数返回 SQL_SUCCESS_WITH_INFO。 用法 请参SQLGetInfo( 返回的信息, InfoType可能值列表,以及 SQLGetInfo() 函数针对该值返回的信息描述。 返回码 SQL_SUCCESS SQL_SUCCESS_WITH_INFO SQL_ERRO...
SQL*Loader-00211: Field name stringstringstring in the FIELD NAMES record in the data file is too long.\n Cause: The field name exceeded the maximum of 30 characters. Action: Specify at most 30 characters. SQL*Loader-00212: The field level ENCLOSED BY clause is not allowed with the...
Left( string, n) returns first n characters from string (n characters from beginning of the string) Right(string, n) returns last n characters from the string (n characters from end of the string) Substring( string, i, n) returns n characters from the string starting from position i...
An SQL script containing more than 25,000 characters causes theexecuteSQLScriptfunction to return an error. Version History Introduced in R2019a Select a Web Site Choose a web site to get translated content where available and see local events and offers. Based on your location, we recommend ...