--ORACLE数据库内创建LEFT CREATE OR REPLACE FUNCTION "LEFT" (str in varchar2,sublen in integer) return varchar2 is strlen integer; begin strlen := length(str); if sublen<=0 then return ''; elsif strlen<=sublen then return str; else return SUBSTR(str,0,sublen); end if; return ''...
create function PadLeft(@num varchar(16),@paddingChar char(1),@totalWidth int) returns varchar(16) as begin declare @curStr varchar(16) select @curStr = isnull(replicate(@paddingChar,@totalWidth - len(isnull(@num ,0))), '') + @num return @curStr end --测试函数: SELECT dbo.Pad...
The LEFT_SHIFT function is also accessible through the << operator. Transact-SQL syntax conventions Syntax syntaxsql Copy LEFT_SHIFT ( expression_value, shift_amount ) expression_value << shift_amount Arguments expression_value Any integer or binary expression that isn't a large object (LOB)...
CreateFunctionStatement CreateIndexStatement CreateLoginSource CreateLoginStatement CreateMasterKeyStatement CreateMessageTypeStatement CreateOrAlterFunctionStatement CreateOrAlterProcedureStatement CreateOrAlterTriggerStatement CreateOrAlterViewStatement CreatePartitionFunctionStatement CreatePartitionSchemeStatement Cr...
Otherwise, use the CAST function to explicitly convert character_expression.Напомена If string_expression is of type binary or varbinary, LEFT will perform an implicit conversion to varchar, and therefore will not preserve the binary input....
Is anexpressionof character or binary data.character_expressioncan be a constant, variable, or column.character_expressioncan be of any data type, excepttextorntext, that can be implicitly converted tovarcharornvarchar. Otherwise, use theCASTfunction to explicitly convertcharacter_expression. ...
When working with SQL LEFT JOINS keep in mind your match from one table to another may match multiple rows. Meaning, your result may have more rows in the result that you have in either table. When columns don’t match, the query the left row, and NULL for the right table columns… ...
creat function function_name #函数名 returns {string|integer|decimal|real} #返回值类型 routin_body #函数体 #1.可以由合法的sql语句构成; #2.可以是简单的select或insert语句构成 #3.如果是复合结构则使用begin...end语句; #4.复用结构可以包含声明,循环,控制结构 ...
block to check the LEN of your input value to avoid passing a negative result to the second argument of the REPLICATE function. No need to worry about passing a 0 to REPLICATE, though: it will simply return an empty string, which is what you'd want since no padding would be necessary....
Thanks.That's even better. I tried to 'Like' your reply but can't yet work out how to do so on this site Eric I don't believe its the cause of your issue but NUMBER is a reserved word in Access and shouldn't be used for a field name...