date_format--Date formatforexpress mode load timestamp_format--Timestamp formatforexpress mode load terminated_by--terminated by characterforexpress mode load enclosed_by--enclosed by characterforexpress mode load optionally_enclosed_by--optionally enclosed by characterforexpress mode load characterset--...
SET TEXTSIZE 0; -- Create variables for the character string and for the current -- position in the string. DECLARE @position INT, @string CHAR(8); -- Initialize the current position and the string variables. SET @position = 1; SET @string = 'New Moon'; WHILE @position <= DATALENGTH...
SETTEXTSIZE0;-- Create variables for the character string and for the current-- position in the string.DECLARE@positionINT, @stringCHAR(8);-- Initialize the current position and the string variables.SET@position=1;SET@string='New Moon'; WHILE @position <= DATALENGTH(@string)BEGINSELECTASCII...
SQL_SNVF_CHARACTER_LENGTHSQL_SNVF_EXTRACTSQL_SNVF_OCTET_LENGTHSQL_SNVF_POSITION SQL_SQL92_PREDICATES 3.0 SQLUINTEGER 位掩碼,列舉 SELECT 語句中支援的述詞,如 SQL-92 中所定義。每個位掩碼旁的括弧中會顯示必須支援此功能的SQL-92 或 FIPS 一致性層級。下列位掩碼可用來判斷數據源支援的選項:SQL_SP_...
返回character_expression 右起 print RIGHT ('acderfv',6) => 'cderfv' 3、SUBSTRING() SUBSTRING (<expression>, <starting_ position>, length) 返回从字符串左边第starting_ position 个字符起length个字符的部分。 print SUBSTRING ('acderfv',1,5) => 'acder' ...
In this case, we are looking for the second occurrence of the character 'e' in the word 'Los Angeles,' and we start the start with the first character of the word. The function returns 10 as the second occurrence of 'e' is in the 10th position. ...
DECLARE @position INT, @nstring NCHAR(12); -- Initialize the current position variable to the first character in -- the string. SET @position = 1; -- Initialize the character string variable to the string to process. -- Notice that there is an N before the start of the string, wh...
13 /* retrieve the last character in the string */ 14 dbms_output.put_line ( SUBSTR (greetings, -1, 1)); 15 16 /* retrieve five characters, 17 starting from the seventh position. */ 18 dbms_output.put_line ( SUBSTR (greetings, 7, 5)); ...
CONCAT function concatenates two string values. LENGTH function returns the length of the input string. SUBSTR function returns a portion of a string from a given start point to an end point. INSTR function returns numeric position of a character or a string in a given string. ...
如果length 长度大于character_expression1 中 start_ position 以右的长度,则character_expression1 只保留首字符。六、数据类型转换函数 1、CAST() CAST (<expression> AS <data_ type>[ length ]) 2、CONVERT() CONVERT (<data_ type>[ length ], <expression> [, style]) 1)data_type为SQL Server系统...