9 10 /* retrieve the first character in the string */ 11 dbms_output.put_line ( SUBSTR (greetings, 1, 1)); 12 13 /* retrieve the last character in the string */ 14 dbms_output.put_line ( SUBSTR (greetings, -1, 1)); 15 16 /* retrieve five characters, 17 starting from the s...
where 模糊查询:like / between and / in / is null / is not null。 %通配符:任意多个字符,包含0个字符。 _通配符:任意单个字符。 \_:代表_。 转义:where last_name like '_$_%' ESCAPE '$';。 betwee and的值包含临界值,临界值不能颠倒顺序。 in不支持通配符in ('a','c');。 <>:不等于<=...
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err.sql: String, contains the full SQL of the failed query. This can be useful when using a higher level interface like an ORM that is generating the queries. err.sqlState: String, contains the five-character SQLSTATE value. Only populated from MySQL server error. err.sqlMessage: String,...
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CHARACTER_LENGTH()是CHAR_LENGTH()的同义词。 COMPRESS(string_to_compress) 压缩一个字符串。这个函数要求 MySQL已经用一个诸如zlib的压缩库压缩过。 否则,返回值始终是NULL。UNCOMPRESS() 可将压缩过的字符串进行解压缩。 mysql>SELECT LENGTH(COMPRESS(REPEAT('a',1000))); ...
MySQL String 函数 MySQL 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 1ASCII()返回最左边字符的数值 2BIT_LENGTH()以位为单位返回参数的长度 3CHAR_LENGTH()返回参数中的字符数 4CHARACTER_LENGTH()CHAR_LENGTH() 的同义词...
Posted Replace last character in field Paul Deakin July 14, 2010 08:47AM Re: Replace last character in field Peter Brawley July 14, 2010 08:53AM Re: Replace last character in field Paul Deakin July 14, 2010 09:02AM Sorry, you can't reply to this topic. It has been closed....
MySQL命令:set names latin1 相当于设置session级别的character_set_client, character_set_connection, 和character_set_results 为latin1字符集。 1.5 简单示例 我们用python来显示下"数据库"在不同字符集下的16进制编码: 代码语言:javascript 复制 text="数据库"gbk_encoded=text.encode('GBK')gbk_hex=gbk_encod...
I have a character field with numbers (numbers in each record is different but the length of the numbers is the same in each record) and would like to...