PostgreSQL 常用对象 PostgreSQL 字符串函数主要用于字符串操作。下表详细介绍了重要的字符串函数 序号函数描述 1 ASCII() 返回最左边字符的数值 2 BIT_LENGTH() 以位为单位返回参数的长度 3 CHAR_LENGTH() 返回参数中的字符数 4 CHARACTER_LENGTH() CHAR_LENGTH() 的同义词 5 CONCAT_WS() 返回连接分隔符 6 ...
INITCAPConvert words in a string to title caseINITCAP(‘hI tHERE’)Hi There LEFTReturn the first n character in a stringLEFT(‘ABC’,1)‘A’ LENGTHReturn the number of characters in a stringLENGTH(‘ABC’)3 LOWERConvert a string to lowercaseLOWER(‘hI tHERE’)‘hi there’ ...
1 row in set (0.00 sec) 1. 2. 3. 4. 5. 6. 7. CHAR_LENGTH(str) 返回字符串str的长度,以字符为单位。多字节字符算作单个字符。这意味着对于包含五个两个字节的字符串,LENGTH()返回10,而CHAR_LENGTH()返回5。 testdb=# SELECT CHAR_LENGTH('text'); +---+ | CHAR_LENGTH('text') | +--...
您可以在ADB_PG_SQL任务中使用聚合函数对指定字符串进行灵活处理。本文为您提供ADB_PG_SQL任务支持的聚合函数的命令格式、参数说明及示例,指导您使用字符串函数完成开发。AnalyticDB for PostgreSQL支持的字符串函数如下。函数 功能 acos... LENGTH 计算字符串str 的长度。命令格式 bigint length(stringstr)参数说明 st...
postgreSQL 17.01 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 SELECT'S0001'ASSTU, unnest(string_to_array('G,E,O,V,I,N,D,U,B,,A,B,C,D,A,B,D,B,C,C,B,A,B,D,A,C,D,A,B,D,A,D,C,B,D,B,D,B,A,C,D,A,C,D,A,A,C,B,A,D',','))ASparts;...
Here we will discuss how to use the string function in PostgreSQL: 1. ASCII(str) Returns the ASCII value of the leftmost character of the string str. SELECTFirstName,ASCII(FirstName)fromPerson Output: 2. BIT_LENGTH(str) Returns the length of the string str in bits. ...
length函数计算的是字符串的长度,而lengthb函数计算的是字符串的字节数。 eg: select length('长安 zlabcd') from dual; 1. 上面语句的结果为8。 2.合并字符串函数 concat(s1,s2),也可以使用“|”关联 eg: seelct concat('中 连','zlsoft') from dual; ...
Number of characters in stringThe following are equivalent:SELECT lastname FROM members WHERE length(lastname) > 8; SELECT lastname FROM members WHERE char_length(lastname) > 8; SELECT lastname FROM members WHERE character_length(lastname) > 8; ...
Let's explore PostgreSQL split string and how to split string in SQL. Read this tutorial and learn everything about Postgres split string and spring operations.
Its length is currently defined as 32 bytes (31 characters plus terminator) but should be referenced using the macro NAMEDATALEN. The length is set at compile time (and is therefore adjustable for special uses); the default maximum length may change in a future release. The type "char...