结构化查询语言（SQL）是一种用于查询数据库的语言。问题应包括代码示例，表结构，示例数据以及正在使用的DBMS实现（例如，MySQL，PostgreSQL，Oracle，MS SQL Server，IBM DB2等）的标记。如果您的问题仅涉及特定的DBMS（使用特定的扩展/功能），请改用该DBMS的标记。用SQL标记的问题的答案应该使用ISO / IEC标准SQL。
claim.Source= rules.SystemType condtions.ruleid =rules.ruleid
来检索行索引。因此，我希望能够基于行索引搜索行，然后在一个SQL嵌套语句中删除该行。 我的代码：
过程代码： 我重命名了包装和函数名称以保持通用：
r函数将CSV文件转换为Parquet文件，但遇到了我一个文件之一的类型问题。我有一个名为代码的列，我想成为varchar而不是bigint。我似乎无法覆盖bigint的转换，这引发了错误。
create table users ( id serial primary key, first_name varchar(255) not null, last_name varchar(255) not null ); insert into users(first_name, last_name) values ('a', 'a');
如何在SQL Server中使用单个SQL查询，我们可以为任何学生获得以下内容 a）顶级老师 b）所有与该学生链接的学生老师
I创建了整个文本表，以避免在CSV的导入中问题。之后，我将数据清理更改为“”。作为避免DILLIMI问题的数字分隔线...
SELECT report_date, SUM(col1) AS sum_col1 FROM my_table GROUP BY report_date ORDER BY report_date;
WITH table_name_1 AS ( SELECT column_name_1, column_name_2, column_name_3, CASE WHEN column_name_19 = 1 THEN 'VALUE_1' WHEN column_name_19 = 2 THEN 'VALUE_2' WHEN column_name_19 = 3 THEN 'VALUE_3' WHEN column_name_19 = 4 THEN 'VALUE_4' END AS column_name_4, CASE WHEN column_name_20 = 1 THEN 'VALUE_5' WHEN column_name_20 = 2 THEN 'VALUE_6' WHEN column_name_20 = 3 THEN 'VALUE_7' WHEN column_name_20 = 4 THEN 'VALUE_8' END AS column_name_5, column_name_6, column_name_7, column_name_8, column_name_9, column_name_10, column_name_11, column_name_12, column_name_13, column_name_14, column_name_15, column_name_16, column_name_17, column_name_18, ROW_NUMBER() OVER (PARTITION BY column_name_1 ORDER BY column_name_16 DESC) AS rn FROM table_name_2 WHERE column_name_21 >= max_pt("table_name_3") AND from_unixtime(column_name_2, 'yyyyMMdd') <= '${date}' AND from_unixtime(column_name_2, 'yyyyMMdd') >= '${date-30}' AND column_name_14 IS NOT NULL AND column_name_22 IS NOT NULL ) WHERE rn = 1, table_name_4 AS ( SELECT column_name_3, column_name_23, column_name_24, column_name_1, column_name_8 FROM table_name_5 WHERE column_name_21 >= (SELECT MAX(column_name_21) FROM table_name_5) AND from_unixtime(column_name_25, 'yyyyMMdd') <= '${date}' AND from_unixtime(column_name_25, 'yyyyMMdd') >= '${date-30}' ) SELECT t4.column_name_3, t4.column_name_23, t4.column_name_24, t4.column_name_1, t4.column_name_8, t1.column_name_1, t1.column_name_2, t1.column_name_3, t1.column_name_5, t1.column_name_6, t1.column_name_7, t1.column_name_8, t1.column_name_9, t1.column_name_10, t1.column_name_11, t1.column_name_12, t1.column_name_13, t1.column_name_14, t1.column_name_15, t1.column_name_16, t1.column_name_17, t1.column_name_18 FROM table_name_1 t1 JOIN table_name_4 t4 ON t1.column_name_1 = t4.column_name_1 ORDER BY t4.column_name_23 DESC;
您如何强制重命名？？？ 重命名为table'dbo.x。 （Microsoft.sqlserver.smo） 为了帮助您，请单击：http：//go.microsoft.com/fwlink?prodname = microsoft+Sql+Server＆prodver = 10.0.2531.0+（
在Mariadb 10.6.20上工作。我正在尝试从字符列中的字符串中提取所有独特的非数字序列。 示例数据： （555）444 3322 +（1.400）-200-4044 Ext200 预期的淘汰...