The SELECT query below demonstrates the use of SUBSTR and INSTR functions. SUBSTR function returns the portion of input string from 1st position to 5th position. INSTR function returns the numeric position of character 'a' in the first name. SELECT SUBSTR (first_name,1,5), INSTR (first_name...
resumable--enable or disable resumableforcurrentsession(DefaultFALSE)resumable_name--text string to help identify resumable statement resumable_timeout--waittime(inseconds)forRESUMABLE(Default7200)date_cache--size(inentries)ofdate conversioncache(Default1000)no_index_errors--abort load on any indexerrors...
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. ...
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...
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...
lpad(str, len[, pad]) - Returns str, left-padded with pad to a length of len. If str is longer than len, the return value is shortened to len characters or bytes. If pad is not specified, str will be padded to the left with space characters if it is a character string, and wi...
SQL_SNVF_CHARACTER_LENGTHSQL_SNVF_EXTRACTSQL_SNVF_OCTET_LENGTHSQL_SNVF_POSITION SQL_SQL92_PREDICATES 3.0 一个SQLUINTEGER 位掩码,用于枚举 SELECT 语句中支持的谓词,如 SQL-92 中定义。必须支持此功能的 SQL-92 或 FIPS 一致性级别显示在每个位掩码旁边的括号中。以下位掩码用于确定数据源支持的选项:SQL_...
The Oracle SQL version of INSTR also allows you to count backward, by entering the position argument as a negative number: INSTR('she sells seashells','s',-2,5) This will tell Oracle SQL to start at the second character from the end of the string (the last “l” in “seashells”) ...
带三个参数的substring,即substring(string from pattern for escape-character),提供了抽取一个匹配 SQL 正则表达式的子串的方法。和SIMILAR TO一样,声明的模式必须匹配整个数据串,否则函数失败并返回空值。为了标识在成功的时候应该返回的模式部分,模式 必须包含逃逸字符的两次出现,并且后面要跟上双引号(")。匹配这两...
Use the INSTR() function to find the starting position of a substring within a string. It works similar to the CHARINDEX() function in Oracle servers. Or the general POSITION() function used inPostgreSQL databases. The Syntax is: INSTR(string, substring [, start_position [, occurrence]]) ...