...语法如下SELECT SUBSTRING(yourColumnName,1,yourIntegerValueToGetTheCharacters) as anyVariableName from yourTableName...创建表的查询如下mysql> create table limitLengthOfLongTextDemo -> ( -> sentence LONGTEXT -> ); 使用i
1228 1229 EXTRACT(type FROM date) 1230 EXTRACT() 函数使用与 DATE_ADD() 或DATE_SUB() 一致的间隔类型,但是它用于指定从日期中提取的部分,而不是进行日期算术运算。 1231 mysql> SELECT EXTRACT(YEAR FROM "1999-07-02"); 1232 -> 1999 1233 mysql> SELECT EXTRACT(YEAR_MONTH FROM "1999-07-02 01:...
语法: from_unixtime(bigint unixtime[, string format]) 返回值: string 说明: 转化UNIX时间戳(从1970-01-01 00:00:00 UTC到指定时间的秒数)到当前时区的时间格式 举例: hive> select from_unixtime(1323308943,'yyyyMMdd') from test_table; 20111208 2. 获取当前UNIX时间戳函数:unix_timestamp 语法: un...
语法:regexp_extract(string subject, string pattern, int index) 返回值:string 说明:将字符串subject按照pattern正则表达式的规则拆分,返回index指定的字符 使用1:select regexp_extract("marry","m(.*?)(ry)",1) from student limit 1; ar .*? 表示匹配任意字符到下一个符合条件的字符 使用2:select reg...
SUBSTRING_INDEX TO_BASE64 TRIM TRIM_IN UCASE UNHEX UPPER url_decode UUID UUID_TO_INT fuzzy-match LIKE NOT LIKE mask MASK MASK_FIRST_N MASK_LAST_N regexp REGEXP REGEXP_EXTRACT REGEXP_EXTRACT_ALL REGEXP_REPLACE REGEXP_REPLACE_ONE
extract string between two characters/string, first character is 'Test Name:' and second character is line break i.e., <br> or end of line. Extracting domain name from FQDN fully qualified domain name see example Extracting only year from getdate() function... Extracting substring betwee...
String Functions lower/upper select lower(‘ABcD12#$e’) from s3object; String Functions char_length character_length select count(*) from s3object where char_length(_3)=3; Complex queries select sum(cast(_1 as int)), max(cast(_3 as int)), substring(‘abcdefghijklm’,(2-1)*3+sum...
Command to extract pager attribute from Active Directory Command to fetch a list of particular job title Command to find out office bit version for remote computers Command to goto start of script Command to retrieve response header information when using Invoke-Restmethod Command Window Stuck In Ins...
How to Use substring() with RegEx to Extract a String How to Replace Substrings How to Modify Arrays How to Compare Arrays How to Concatenate Strings How to Convert the Case of a String How to Create an Array How to Insert Data Into an Array How to Query Arrays How to Use string_agg...
1一个 SQL 语句中的 select_expression 或 where_definition 可由任何使用了下面所描述函数的表达式组成。23包含NULL的表达式总是得出一个NULL值结果,除非表达式中的操作和函数在文档中有另外的说明。45注意:在一个函数名和跟随它的括号之间必须不存在空格。这有助于 MySQL 语法分析程序区分函数调用和对恰巧与函数同名...