为了避免出现这种情况,就应该处理NULL值。使用NVL函数对NULL进行处理,语法格式如下: NVL(string1,replace_with) 功能:如果string1为NULL,则NVL函数返回replace_with的值,否则返回sting1的值,如果两个参数都为NULL,则返回NULL。 该函数的目的是把一个控制(NULL)转换成一个实际的值。其中string1和replace_with的数据...
REPLACE returns char with every occurrence of search_string replaced with replacement_string. If replacement_string is omitted or null, then all occurrences of search_string are removed. If search_string is null, then char is returned. REPLACE的实现是由TRANSLATE函数为基础,在REPLACE中,原值和被替换...
TRANSLATE是REPLACE所提供的功能的一个超集.如果from_str比to_str长,那么在from_str中而不在to_str中而外的字符将从string中被删除,因为它们没有相应的替换字符. to_str不能为空.Oracle把空字符串认为是NULL,并且如果TRANSLATE中的任何参数为NULL,那么结果也是NULL. 代码语言:javascript 代码运行次数:0 运行 AI...
NVL( string1, replace_with) :如果string1为NULL,则NVL函数返回replace_with的值,否则返回string1的值,如果两个参数都为NULL ,则返回NULL。 SIGN(n) :该函数用于检测数字的正负.如果数字n小于0,则函数的返回值位-1;如果数字n的值等于0,则函数的返回值等于0,如果数字n大于0,则函数的返回值等于1。 CEIL(n...
replace: 语法:REPLACE ( char , search_string [, replacement_string] ) REPLACE returns char with every occurrence of search_string replaced with replacement_string. If replacement_string is omitted or null, then all occurrences of search_string are removed. If search_string is null, then char ...
■ The measure_expr can be any expression. Null values in the measure column are ignored. ■ The delimiter_expr designates the string that is to separate the measure values. This clause is optional and defaults to NULL. ■ The order_by_clause determines the order in which the concatenated ...
null = replace null with given value escape = escape character for special characters escf/t = escape from/to characters list format = MYSQL: MySQL Insert SQLs, SQL: Insert SQLs. exec = the command to execute the SQLs. prehead = column name prefix for head line. ...
The REPLACE function in Oracle is a versatile string manipulation tool used to replace all occurrences of a specified substring within a string with another substring. It is particularly useful for data cleaning and transformation tasks in SQL queries. If replacement_string is omitted or null, then...
在Oracle中,replace()函数用于替换字符串, replace(srcstr, oldsub[, newsub ] ),和PostgreSQL中的replace函数用法基本一致。只是需要注意在Oracle中无第三个参数时,代表删除此字符,在PostgreSQL可将第三个参数设置为''。 stragg(str,[str]) Oracle里的stragg函数实现在分组内对列值的拼接,它和listagg类似,但是不...
--查询回收站lob对象数量(可选),lob数量不一致排查 select owner,type,count(*) from dba_recyclebin group by owner,type order by owner; 无返回 --数据量统计 ---新增count_rows 函数 CREATE OR REPLACE FUNCTION count_rows ( table_name IN varchar2, owner IN varchar2 := NULL ) RETURN number AU...