sql server考虑NULL作为一个真正的独特价值，但它不应该；在sql中null意思是“一个存在但缺失的值，而...
> INSERT t2 VALUES(1,1),(2,2),(3,3),(5,5); QueryOK, 4 rows affected Records: 4 Duplicates: 0 Warnings: 0 obclient> SELECT * FROM t2; +---+---+ | c1 | c2 | +---+---+ | 1 | 1 | | 2 | 2 | | 3 | 3 | | 5 | 5 | +---+---+ 4 rows in set obclien...
If the actual rows in the data file aren't sorted according to the order that is specified, or if the UNIQUE hint is specified and duplicates keys are present, an error is returned. Column aliases are required when ORDER is used. The column alias list must reference the derived table that...
RPM方式安装后的GreatSQL默认配置不是太合理,建议参考下面这份my.cnf文档: my.cnf for GreatSQL 8.0.25-16(https://gitee.com/GreatSQL/GreatSQL-Doc/blob/master/docs/my.cnf-example-greatsql-8.0.25-16) 调整文档中关于datadir目录配置等相关选项,默认datadir=/var/lib/mysql通常都会改掉,例如替换成datadir...
Deletion of the duplicates in Excel file using Powershell Delimiter with import-csv Desired State Configuration (DSC) Resource fails Detect "Obtain DNS server address automatically" set Detect if BitLocker Protection Status is 0, enable Detect if variable has been previously declared? Detect integrated...
If multiple indexes are used in a single hint list, the duplicates are ignored, and the rest of the listed indexes are used to retrieve the rows of the table. The order of the indexes in the index hint is significant. A multiple index hint also enforces index ANDing, and the query opt...
Finding Duplicates with DISTINCT and HAVING Finding last occurrence of a space in a string Finding spaces in a string Finding the second space in a string First 3 columns data of a table without specifying the column names - SQL Server First and Last day of previous month from getdate() Fi...
the target table. When performing row movement, DB2 executes before update triggers first, which may modify the row. The rejected row may then be processed by before insert triggers which may again modify the row in a way that it is now accepted by the check constraints of the target ...
SQL Server replication duplicates data from a Publisher server to a Subscriber and offers three types of replication: Transactional replication for server-to-server environments, where changes are delivered from the publisher to the subscriber as they occur. Merge replication for server-to-client e...
execute_batch/2 - each item in a batch has it's own named statement (but it's allowed to have duplicates)example:{ok, S1} = epgsql:parse(C, "one", "select $1::integer", []), {ok, S2} = epgsql:parse(C, "two", "select $1::integer + $2::integer", []), [{ok, [{...