9 10 /* retrieve the first character in the string */ 11 dbms_output.put_line ( SUBSTR (greetings, 1, 1)); 12 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 s...
How to find first/last occurrence of any character/ word in the stringis one of the most frequent problems that we usually come across whenever we are dealing with the string manipulation in SQL Server. Given below are the solutions : ...
SQL Server 2000 Forums Transact-SQL (2000) How to locate last occurrence of character in string?
(1)alter database 数据库名 character set 字符集:数据库的字符集修改操作。 4.删除数据库 (1)drop database 数据库名:从Mysql中永久的删除某个数据库。 数据表相关 一个数据库中可以有n个数据表,每个数据表中可以有n个字段(列),在创建表的时候需要定义好字段的数据类型。 1.常用数据类型 类型描述 int ...
SQL_CCS_CREATE_CHARACTER_SETSQL_CCS_COLLATE_CLAUSESQL_CCS_LIMITED_COLLATIONSQL-92 完全一致性驱动程序将始终按支持返回所有这些选项。 返回值为“0”表示 不支持 CREATE CHARACTER SET 语句。 SQL_CREATE_COLLATION 3.0 一个SQLUINTEGER 位掩码,用于枚举 CREATE COLLATION 语句中的子句,如数据源支持的 SQL-92 ...
--The translate will happen when any characterinthe string matches the characterinthe`matchingString`--A1B2C3selecttranslate("AaBbCc","abc","123"); JSON函数 1. get_json_object 代码语言:javascript 代码运行次数:0 运行 AI代码解释 --v2
== false) { try { $exists = (mysqli_num_rows( $result ) > 0); // The '@' character suppresses errors } catch(Exception $e) { $exists = false; } } break; case SQLITE: global $sqlite_db_connection; $query = "SELECT first_name, last_name FROM users WHERE user_id = $id;"...
/*lower('SQL Course'):将所有的内容转成小写upper('SQL Course'):将所有的内容转成大写*/SELECTLOWER('aAbCdE');SELECTUPPER('aAbCdE');SELECTLOWER(first_name),UPPER(last_name)FROMemployees;/*concat('Hello', 'World'): 字符串拼接SUBSTR('HelloWorld',1,5): 截取子串1:表示起始位置(注意:索引位置...
· 错误:1300 SQLSTATE: HY000 (ER_INVALID_CHARACTER_STRING) 消息:无效的%s字符串: '%s' · 错误:1301 SQLSTATE: HY000 (ER_WARN_ALLOWED_PACKET_OVERFLOWED) 消息:%s()的结果大于max_allowed_packet (%ld),已截短 · 错误:1302 SQLSTATE: HY000 (ER_CONFLICTING_DECLARATIONS) ...
The following example shows how to return only a part of a character string. From thedbo.DimEmployeetable, this query returns the family name in one column with only the first initial in the second column. SQL -- Uses AdventureWorksSELECTLastName,SUBSTRING(FirstName,1,1)ASInitialFROMdbo.Dim...