REPLICATE (character_expression integer_expression) 如果integer_expression 值为负值,则返回NULL 。 3、REVERSE() 将指定的字符串的字符排列顺序颠倒。 REVERSE (<character_expression>) 其中character_expression 可以是字符串、常数或一个列的值。 4、REPLACE() 返回被替换了指定子串的字符串。 REPLACE (<string_...
REVERSE (<character_expression>) 其中character_expression 可以是字符串、常数或一个列的值。 4、REPLACE() 返回被替换了指定子串的字符串。 REPLACE (<string_expression1>, <string_expression2>, <string_expression3>) 用string_expression3 替换在string_expression1 中的子串string_expression2。 4、SPACE()...
三、取子串函数 1、left() LEFT (<character_expression>, <integer_expression>) 返回character_expression 左起 integer_expression 个字符。 2、RIGHT() RIGHT (<character_expression>, <integer_expression>) 返回character_expression 右起 integer_expression 个字符。 3、SUBSTRING() SUBSTRING (<expression>,...
SQL نسخ SELECT LEFT(Name, 5) FROM Production.Product ORDER BY ProductID; GO B. Using LEFT with a character stringThe following example uses LEFT to return the two leftmost characters of the character string abcdefg.SQL نسخ SELECT LEFT('abcdefg',2); GO ...
reverse(string_expression) select reverse('abc') /* 结果为:cba*/ 1. 8. stuff():删除指定长度的字符,并在指定的起点处插入另一组字符 stuff(character_expression, start, length, character_expression)start:整数,指定删除和插入的开始位置。length:整数,指定要删除的字符数。
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...
USE AdventureWorks; GO SELECT LEFT(Name, 5) FROM Production.Product ORDER BY ProductID; GO B. Using LEFT with a character string The following example uses LEFT to return the two leftmost characters of the character string abcdefg. Copy SELECT LEFT('abcdefg',2) GO Here is the result ...
B. Using LEFT with a character string The following example usesLEFTto return the two leftmost characters of the character stringabcdefg. SQL SELECTLEFT('abcdefg',2); GO Here's the result set. -- ab (1 row(s) affected) Examples: Azure Synapse Analytics and Analytics Platform System (PDW)...
B. Using LEFT with a character string The following example usesLEFTto return the two leftmost characters of the character stringabcdefg. SQL SELECTLEFT('abcdefg',2); GO Here's the result set. -- ab (1 row(s) affected) Examples: Azure Synapse Analytics and Analytics Platform System (PDW)...
注意:DATALENGTH、CHAR_LENGTH和CHARACTER_LENGTH函数是相同的。 对于新代码,建议使用CHAR_LENGTH函数。 DATALENGTH是为TSQL兼容性而提供的。 用户7741497 2022/04/01 2470 SQL函数 SUBSTR 编程算法sql SUBSTR 不能与流数据一起使用。如果 string-expression 是流字段,则 SUBSTR 生成 SQLCODE -37。使用 SUBSTRING 从流...