SELECTname,SUBSTRING(name,1,1)ASInitial,SUBSTRING(name,3,2)ASThirdAndFourthCharactersFROMsys.databasesWHEREdatabase_id <5; 結果集如下所示。 NAMEInitialThirdAndFourthCharacters mastermst tempdbtmp modelmde msdbmdb 以下是如何顯示字串常數abcdef的第二、第三和第四個字元。
name初始ThirdAndFourthCharacters 主mst tempdbtmp 模型mde msdbmdb 以下示例说明如何显示字符串常量abcdef中的第二个、第三个和第四个字符。 SQL SELECTx =SUBSTRING('abcdef',2,3); 结果集如下。 复制 x --- bcd (1 row(s) affected) B. 对 text...
BusinessEntityID FirstName LastName --- --- --- 285 Syed Abbas 293 Catherine Abel (2 row(s) affected) 虽然BusinessEntityID 列宽只有四个字符,但已将其扩展以适应更长的列名。 默认情况下,输出会在 80 个字符处终止。 可通过使用 -w 选项或设置 SQLCMDCOLWIDTH 脚本变量更改此宽度。XML 输出格式从...
You don't have to specify the EXECUTE keyword when you execute stored procedures when the statement is the first one in a batch.SQL Server system stored procedures start with the characters sp_. They are physically stored in the Resource Database, but logically appear in the sys schema of ...
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...
When you bulk transfer data between instances of Microsoft SQL Server and the data file contains Unicode character data but not any extended or DBCS characters, use the Unicode character format. For more information, see Use unicode character format to import or export data (SQL Server). Consider...
CONCAT(string1, string2, ...) 1. string1、string2等的数量可以是零个或多个,分别表示需要合并的字符串。 使用示例: 假设现在有一个名为employees的表格,其中包含员工的名字(first_name和last_name),需要将它们合并为一个字段(full_name)。 SELECT CONCAT(first_name, ' ', last_name) AS full_name FR...
/* retrieve the first character in the string */ dbms_output.put_line ( SUBSTR (greetings, 1, 1)); /* retrieve the last character in the string */ dbms_output.put_line ( SUBSTR (greetings, -1, 1)); /* retrieve five characters, ...
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 ...
The following example produces a list of names in a single result cell, separated with carriage returns.SQL העתק USE AdventureWorks2022; GO SELECT STRING_AGG (CONVERT(NVARCHAR(max),FirstName), CHAR(13)) AS csv FROM Person.Person; GO ...