在PostgreSQL中,将整数(int)转换为字符串可以通过使用to_char()函数或者类型转换操作符::来实现。以下是几种将int类型转换为string类型的方法: 方法一:使用to_char()函数 to_char()函数允许你指定输出的格式,非常适合需要格式化输出的场景。 sql SELECT to_char(12345, '999999999'); 这个查询将返回字符串'1234...
SELECT x::integer AS int_value FROM table_name WHERE id = 1; SELECT CAST(x AS text) AS str_value FROM table_name WHERE id = 1; 字符串与日期/时间之间的转换:可以使用TO_DATE()和TO_TIMESTAMP()函数,例如: SELECT TO_DATE(x, 'YYYY-MM-DD') AS date_value FROM table_name WHERE id =...
5、PostgreSQL没有MySQL的group_concat函数,也没有Oracle的wm_concat函数,但是可以通过这样的方式来实现聚合功能(array_to_string(array_agg(聚合列)),然后后面可以自定义分隔符,下例就是以英文逗号作为分隔符): SELECT group_by_column, array_to_string ( array_agg ( aggregate_column ), ',' ) AS aggregat...
`age`int(11)DEFAULTNULL) ENGINE=InnoDBDEFAULTCHARSET=utf8;-- mysql高版本也可以不指定int bigint长度# 如果是mysql至少要指定varchar的长度createtablet2(idbigint,namevarchar(256), ageint); pgsql -- pgsql不能指定int bigint,varchar的长度createtablet1(idbigint,namevarchar, ageint);-- 实际生成的...
CAST(oti.institution_id AS VARCHAR)将int型institution_id转为varchar型 将时间字段格式化为指定格式to_char(create_time,'yyyy-mm-dd') 统计同一个表中某个字段在不同条件下的累加之和: SELECT 'SBZS' AS name, sum(device_num) AS Count FROM sensor_info ...
time_t raw_time=std::chrono::high_resolution_clock::to_time_t(now); struct tm tm_info=*localtime(&raw_time); std::stringstream ss; ss<<std::put_time(&tm_info, "%Y%m%d%H%M%S");if(is_exact) { auto seconds=std::chrono::duration_cast<std::chrono::seconds>(now.time_since_epoch...
PgSqlIsAutoToLower = false,//增删查改支持驼峰表 PgSqlIsAutoToLowerCodeFirst = false, // 建表建驼峰表。5.1.3.30 }; 还是一样报错。提示找不到字段,发现字段没自动转大写 0 回复 0000 VIP0 2023/10/11 数据实体 [SqlSugar.SugarTable("X_X_AA", "WMS任务表")] public class WMSTask {...
When you want to upgrade to 2017111101 (I reckon it happens in the update to 2017050100) The following error is thrown when your database is PostgreSQL Debug info: ERROR: column "username" cannot be cast automatically to type bigint HINT...
int output_pgsql_t::pgsql_out_way(osmid_t id, taglist_t &outtags, const nodelist_t &nodes, int polygon, int roads) { /* Split long ways after around 1 degree or 100km */ double split_at; if (m_options.projection->target_latlon()) ...
MyTest=# SELECT cast(-44 as bit(12)); bit --- 111111010100 (1 row) MyTest=# SELECT '1110'::bit(4)::integer; int4 --- 14 (1 row) 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18.