VARCHARGROUP_CONCAT([DISTINCT]VARCHAR列名[,VARCHARsep] 该函数是类似于sum() 的聚合函数,group_concat 将结果集中的多行结果连接成一个字符串-- group_concat对于收集的字段只能是string,varchar,char类型--当不指定分隔符的时候,默认使用 ','VARCHAR:代表GROUP_CONCAT函数返回值类型 [DISTINCT]:可选参数,针对需...
SELECT TO_CHAR( SYSDATE,'yyyy-MM-dd HH24:mi:ss') FROM DUAL; -- oracle -- 字符串类型转时间类型 SELECT STR_TO_DATE( NOW(), '%Y-%m-%d %H'); -- mysql SELECT TO_DATE( '2020-01-09', 'yyyy-MM-dd') FROM DUAL; -- oracle 【注:oracle中前者字符串时间的格式需与后者转换格式相同哦...
Apache Doris is an easy-to-use, high-performance and real-time analytical database based on MPP architecture, known for its extreme speed and ease of use. It only requires a sub-second response time to return query results under massive data and can support not only high-concurrent point ...
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dataroaring changed the title [Enhancement] insert large int to varchar [Enhancement] insert large int to char May 10, 2023 is-shidian commented May 19, 2023 Hello, I'm new to here . Could I have a try? Yukang-Lian assigned is-shidian May 19, 2023 Yukang-Lian self-assigned this...
⑥ --multi-to-one-origin && --multi-to-one-target (since 1.5.0) 支持将上游多张表写入Doris中一张表 四、最佳实践 1. 同步主键表和非主键表 Apache Doris主要有Unique,Aggreate,Duplicate三种数据模型,对于数据源(MySQL,Oracle,Postgres,SQL Server)库中含有主键的表,将直接将该表映射成Doris Unique 表...
#include "time_to_sec.h" namespace doris_udf { IntVal TIME_TO_SEC(FunctionContext* context, const StringVal& time) { // handle null if (time.is_null) { return IntVal::null(); } // clear other str using namespace std; const string timestr((char *)time.ptr); const regex r("^...
C++ #include "time_to_sec.h" namespace doris_udf { IntVal TIME_TO_SEC(FunctionContext* context, const StringVal& time) { // handle null if (time.is_null) { return IntVal::null(); } // clear other str using namespace std; string timestr((char *)time.ptr); string segSign = "...
+ return baseType.equals("CHAR") + ? ScalarType.createCharType(length) : ScalarType.createVarcharType(length); + } + case "STRING": + case "TEXT": + return ScalarType.createStringType(); + case "JSON": + return ScalarType.createJsonbType(); ...
初始可以通过 root 或 admin 用户创建数据库 create database test_db; 查看数据库 show databases; 授权 grant all on test_db to test; 注意 可以使用help command查看语法帮助,不清楚命令全名的话可以使用 ‘help 某一字段’ 进行模糊查询 information_schema 数据库是为了兼容 MySQL 协议而存在的 ...