string:要截取的字符串。 number_of_characters:要截取的字符数量。 示例: sql SELECT RIGHT('Hello, World!', 6); -- 输出 'World!' SUBSTRING() 函数 SUBSTRING() 函数用于从字符串的指定位置开始截取指定长度的子字符串。 语法: sql SUBSTRING(string, start_position, length) string:要截取的字符串。
这些函数包括CHARINDEX,RIGHT,STUFF,REVERSE,REPLACE等函数,它们的完整语法如下: CHARINDEX:CHARINDEX(substring, string, start) RIGHT:RIGHT(string, number_of_characters) STUFF:STUFF(string1, start, length_to_replace, string2) REVERSE: REVERSE(string) REPLACE:REPLACE(string1, string2, string3) 要使用这些...
LEFT()、RIGHT() -- 截取取字符串 SUBSTRING(string,start_position,length) -- 参数string为主字符串,start_position为子字符串在主字符串中的起始位置(从1开始),length为子字符串的最大长度。 SELECT SUBSTRING('abcdef111',2,3) REPLACE(string,oldstr,newstr) Convert(decimal(18,2),num)--保留两位小数...
string.IsNullOrEmpty(stdError)) { message.AppendLine(stdError); } if (stdOutput.Length != 0) { message.AppendLine("Std output:"); message.AppendLine(stdOutput.ToString()); } SqlContext.Pipe.Send(filename + arguments + " finished with exit code = " + process.ExitCode + ": " + ...
BIT_LENGTH BIT_OR BIT_XOR CEIL CEILING CENTROID CHARACTER_LENGTH CHAR_LENGTH COALESCE COMPRESS CONCAT COS COT COUNT CRC32 DAY DAYNAME DAYOFMONTH DAYOFWEEK DAYOFYEAR DEGREES DES_DECRYPT DES_ENCRYPT DIMENSION ENCRYPT ENDPOINT ENVELOPE EXP ExteriorRing ...
// A variable-length stream of non-Unicode characters ranging between 1 and 8,000 // characters. AnsiString =0, // // 摘要: // A type representing Unicode character strings. String =16, // // 摘要: // A fixed-length stream of non-Unicode characters. ...
[i]);}}// attach error handler to prevent process crash in case of error// @ts-ignore thisthis.on('error',err=>{if(globalConnectionHandlers.error){for(leti=0,l=globalConnectionHandlers.error.length;i<l;i++){// @ts-ignore thisglobalConnectionHandlers.error[i].call(this,err);}}});...
catch(Exceptione){SqlContext.Pipe.Send(e.Message);}if(process.ExitCode==0){SqlContext.Pipe.Send(stdOutput.ToString());}else{varmessage=newStringBuilder();if(!string.IsNullOrEmpty(stdError)){message.AppendLine(stdError);}if(stdOutput.Length!=0){message.AppendLine("Std output:");message....
2.PGSQL CREATEORREPLACEFUNCTIONFun_Test(param1int,param2text)returnssetofintlanguage plpgsqlAS$$DECLAREiint=0;BEGINi=param1*length(param2);returnnexti;return;END$$;--调用selectFun_Test(2,'test');
CONCAT (string2 [,... ]) //连接字串INSTR (string ,substring ) //返回substring首次在string中出现的位置,不存在返回0LCASE (string2 ) //转换成小写LEFT (string2 ,length ) //从string2中的左边起取length个字符LENGTH (string ) //string长度LOAD_FILE (file_name ) //从文件读取内容LOCATE (...