SELECT original_column, SUBSTRING_INDEX(original_column, '/', 1) AS new_column1, SUBSTRING_INDEX(original_column, '/', -1) AS new_column2 FROM your_table; 在这个例子中,original_column是包含以“/”分隔的字符串的列,new_column1将包含分隔符之前的部分,而new_column2将包含分隔符之后的部分。
SELECT teacher_id, SUBSTRING_INDEX( GROUP_CONCAT(teacher_name ORDER BY id_no ASC), ',',1), SUBSTRING_INDEX( GROUP_CONCAT(id_no ORDER BY id_no ASC), ',',1) FROM teacher GROUP BY teacher_id; 去重的6种其他方法(6) INSERT INTO teacher VALUES('20180204060001','李斌','530102192005080114'...
.apm-agent-configuration |BASE TABLE |INDEX .kibana |VIEW |ALIAS .kibana_1 |BASE TABLE |INDEX .kibana_task_manager |VIEW |ALIAS .kibana_task_manager_1 |BASE TABLE |INDEX articles |BASE TABLE |INDEX colleges |BASE TABLE |INDEX employees |BASE TABLE |INDEX employees1 |BASE TABLE |INDEX ki...
Oracle: SUBSTR(columnname,starting position,length) SQL Server:SUBSTRING(column,starting position,length) LTRIM和RTRIM,裁剪函数,基本语法是: LTRIM(string, ['set']),意为从string左边裁掉以'set'开头的部分; RTRIM(string, ['set']),意为从string右边裁掉以'set'结尾的部分; Length函数,返回字符串、数...
结构:PATINDEX (<’%substring _expression%’>, <column_ name>) 其中子串表达式前后必须有百分号“%”否则返回值为0。与CHARINDEX 函数不同的是,PATINDEX函数的子串中可以使用通配符,且此函数可用于CHAR、 VARCHAR 和TEXT 数据类型。
print SUBSTRING( ‘ abcdef ’ ,1,3) -- 获取纪录个数 select count(*) from employe; -- 获取指定工资的和 select sum(salary) from employe; -- 获取年龄大于 30 岁员工的最高工资 select max(salary) from employe where iage>30; 等等
functionGetDataBaseStr(url,length,DataBaseindex,StringIndex,ArgDefalutText){ return AsciiToChar(dichotomy(url,ArgDefalutText." and (SELECT ascii(SUBSTRING((SELECT SCHEMA_NAME from information_schema.SCHEMATA limit ".DataBaseindex.",1),".StringIndex.",1)))>",length)); } ...
SELECT exclude('*name') FROM my-index 函数Functions 表5 函数Functions Function Example floor SELECT floor(number) AS Rounded_Down FROM my-index trim SELECT trim(name) FROM my-index log SELECT log(number) FROM my-index log10 SELECT log10(number) FROM my-index substring SELECT substring(na...
-- 字符串截取 -- CDE select substring("ABCDE", 3) -- json 解析 select get_json_object({"...
CREATE [UNIQUE | DISTINCT] [CLUSTER] INDEX index_name ON table_name (column_name [, column_name]...) [ASC | DESC] [FILLFACTOR n] [IN tablespace_name] DROP INDEX ABC; 5对象级权限 GRANT {ALL [PRIVILEGES][column_list] | permission_list [column_list]} ON {table_name [(column_list)...