https://stackoverflow.com/questions/5538187/why-sql-server-ignores-vaules-in-string-concatenation-when-order-by-clause-speci/5538210#5538210 https://stackoverflow.com/questions/194852/how-to-concatenate-text-from-multiple-rows-into-a-single-text-string-in-sql-serv...
def filter_by(self, **kwargs): r"""Apply the given filtering criterion to a copy of this :class:`_query.Query`, using keyword expressions. e.g.:: session.query(MyClass).filter_by(name = 'some name') Multiple criteria may be specified as comma separated; the effect is that they wi...
SELECTid,...,creator,modifier,create_time,update_timeFROMstatementWHERE(account_number='XXX'ANDcreate_time>='2022-04-24 06:03:44'ANDcreate_time<='2022-04-24 08:03:44'ANDdc_flag='C')ORDERBYtrade_date_timeDESC,idDESCLIMIT0,1000; 优化前:SQL 执行超时被 kill 了 SELECTid,...,creator,mo...
mysql> select distinct tiny_column from big_table limit 2; mysql> -- Returns the unique combinations of values from multiple columns. mysql> select distinct tiny_column, int_column from big_table limit 2; distinct可以和聚合函数(通常是count函数)一同使用,count(disitnct)用于计算出一个列或多个...
or sinks.Can be used multiple times.-l,--library<JARdirectory>AJARfile directorywithwhich everynewsessionis initialized.The files might contain user-defined classes neededforthe executionofstatements suchasfunctions,table sources,or sinks.Can be used multiple times.-p,--port<service port>The port...
SQL_MULTIPLE_ACTIVE_TXN SQL_NEED_LONG_DATA_LEN SQL_NULL_COLLATION SQL_PROCEDURE_TERM SQL_SCHEMA_TERM SQL_SCROLL_OPTIONS SQL_TABLE_TERM SQL_TXN_CAPABLE SQL_TXN_ISOLATION_OPTION SQL_USER_NAME 支持的 SQL InfoType 参数的以下值返回有关数据源支持的 SQL 语句的信息。 这些信息类型描述的每个功能的 SQL...
SQL ORDER BY is versatile. Use theORDER BYkeyword to sort results with a SELECT statement. You can sort over multiple columns, in both ascending and descending order. Table of contents Introduction to SQL ORDER BY SQL ORDER BY Two Columns ...
> SELECT id, sum(quantity) FROM dealer GROUP BY 1 ORDER BY 1; id sum(quantity) --- --- 100 32 200 33 300 13 -- Multiple aggregations. -- 1. Sum of quantity per dealership. -- 2. Max quantity per dealership. > SELECT id, sum(quantity) AS sum, max(quanti...
Multiple Lateral View可以实现类似笛卡尔乘积。Outer关键字可以把不输出的UDTF的空结果,输出成NULL,防止丢失数据。 行转列 相关参数说明: CONCAT(string A/col, string B/col…):返回输入字符串连接后的结果,支持任意个输入字符串; CONCAT_WS(separator, str1, str2,...):它是一个特殊形式的 CONCAT()。第一...
explode(a) - separates the elements of array a into multiple rows, or the elements of a map into multiple rows and columns explode(array)将array列表里的每个元素生成一行; explode(map)将map里的每一对元素作为一行,其中key为一列,value为一列; ...