big5_to_euc_tw | 11 | 10 | 36 | 4 | big5_to_euc_tw | t big5_to_mic | 11 | 10 | 36 | 7 | big5_to_mic | t big5_to_utf8 | 11 | 10 | 36 | 6 | big5_to_utf8 | t euc_cn_to_mic | 11 | 10 | 2 | 7 | euc_cn_to_mic | t euc_cn_to_utf8 | 11 | 10 ...
函数:convert_from(string bytea, src_encoding name) 说明:Convert string to the database encoding. The original encoding is specified by src_encoding. The string must be valid in this encoding. 转换字符串编码,自己要指定源编码,目标编码默认为数据库指定编码, 例子:convert_from('text_in_utf8', '...
Full Convert migration in 4 easy steps 1. PostgreSQL We will choose PostgreSQL from the list of available source database engines. Connecting to Postgres is straightforward - we need to specify server name/IP, username, password and database name. 2. MySQL We will choose MySQL from the ...
PostgreSQL , conversion , pg_conversion , 拼音 , 编码转换 , convert , convert_to , convert_from 背景 国内的应用,在文本排序上基本都是按照拼音来进行排序的。 在不同的字符集中,汉字的编码可能不一样,比如UTF8和GBK,其中GBK是按拼音的顺序进行编码的,而UTF8则不是。 所以如果你的数据库使用了UTF8编码...
Converting a PostgreSQL database to MySQL manually can be a complex and time-consuming process, which is why using a tool such as DBConvert can be helpful. DBConvert is a powerful and user-friendly tool that automates the process of converting a PostgreSQL database to MySQL. ...
PostgreSQL提供了一些内置的类型转换函数,例如TO_DATE、TO_TIMESTAMP、TO_NUMBER等,具体用法取决于你想要进行的转换。例如: SELECTTO_DATE'2022-01-01''YYYY-MM-DD' 上述语句将字符串'2022-01-01'转换为日期类型。 需要注意的是,不同数据库系统可能有不同的转换函数和语法,上述方法主要适用于PostgreSQL。在实际使...
以默认参数为例,ConvertToXSegs(max_wal_size_mb, wal_segment_size)就是64。 CheckPointCompletionTarget就是checkpoint_completion_target参数的值,默认0.9。 所以CheckPointSegments = int(64/(1+0.9)) = 33,也就是当生成日志数超过33个时,需要做检查点。
convert(string using conversion_name) text 使用指定的转换名字改变编码。 convert('PostgreSQL' using iso_8859_1_to_utf8) 'PostgreSQL' lower(string) text 把字串转化为小写 lower('TOM') tom octet_length(string) int 字串中的字节数 octet_length('jose') 4 overlay(string placing string from int ...
CONVERT(varchar(200), "+fieldName+", 120) "+aliasName; 字符转数字类型 1.TO_NUMBER 递归 1.start with connect by prior 2. with recursive as 字符串拼接 1.wm_concat 2.string_agg decode(条件,值1,返回值1,值2,返回值2,...值n,返回值n,缺省值) ...
Run the below statement to convert the given constant string to an integer: SELECTCAST('572'ASINTEGER); The output proves that the CAST operator takes a constant string and converts it into the desired data type, i.e., integer. Example #2: How to Use the CAST Operator to Table’s Co...