Function: Returns: --- SUBSTRING(C1,-2,2,OCTETS) -- a zero-length string SUBSTRING(C1,-2,4,OCTETS) 'A' SUBSTRING(C1,-2,OCTETS) 'ABCDEFG' SUBSTRING(C1,0,1,OCTETS) -- a zero-length string
The REGEXP_SUBSTR scalar function returns one occurrence of a substring of a string that matches the regular expression pattern.
example 4: define a scalar function that reverses a string. 1. create function reverse(instr varchar(4000)) returns varchar(4000) deterministic no external action contains sql begin atomic declare revstr, reststr varchar(4000) default ''; declare len int; if instr is null then return null; ...
language SQL reads SQL DATA return select cid,number,score from test_taken where salary between (begin_range) and score(end_range) example 1: define a scalar function that returns the tangent of a value using the existing sine and cosine functions. create function tan (x double) returns doub...
db2 connect to<my_db>user<uid>using<pwd>db2setcurrent schema='REGEXP'db2-td@-f/home/xx/db2-regex/scripts/sql/db2_regex_functions.sql 即可。 4个函数的使用方法如下: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 selectIDfromREGEXP.REGEXP_STRINGSwhereREGEXP_LIKE(STRING,'^.EF[ ]+SAVE...
The SUBSTR functions return a portion of char, beginning at character position, substring_length characters long. DB2:引用自 DB2_UDB_V8_SQL_REFERENCE The SUBSTR function returns a substring of a string. 对于其他的我不做过多的说明,我在这里只是想说明他们在对于第二、三个参数上的差异做一些解析。
example 1: define a scalar function that returns the tangent of a value using the existing sine and cosine functions. create function tan (x double) returns double language sql contains sql no external action deterministic return sin(x)/cos(x) ...
DB2常用SQL的写法(持续更新中...) -- Author: lavasoft -- Date : 2006-12-14-- 创建一个自定义单值类型 create distinct type var_newtype as decimal(5,2) with comparisons; -- var_newtype 类型名 -- decimal(5,2) 实际的类型-- 删除一个自定义单值类型...
SQL Server:将字符串显式转换为日期(SQL Server: Convert string to date explicitly) The second approach for converting data types is the explicit conversion which is done by using some functions or tools. In SQL Server, converting a string to date explicitly can be achieved using CONVERT(). CAST...
DB2查看执行过长的SQL 朋友遇到一个DB2问题,DB2占用了大量的临时表空间,db2pd -d testdb -act发现有大量的SQL长时间运行,为了测试该问题,写了一个简单的处理问题的流程。 1.创建测试表 CREATE TABLE FUND_DAILY_INCOME ( ID BIGINT NOT NULL GENERATED ALWAYS AS IDENTITY,...