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Comparison between MYSQL and MSSQL and MYSQLMSSQL   Recently, I was modifying the MSSQL statements related to a company's product to statements that can be executed on MYSQL.   L Advantage Analysis: MYSQL is short, easy to use, easy to use, and free

1,access Database Introduction relational database management system, Microsoft's small database advantages: improve speed, reduce the amount of code, avoid the use of process call defects: data is too large, performance is degraded, database brush

Oracle statement code Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->Create or replace view qua. view_lose_check_request_cut Select M. Wo, M. Lot, M. mat_id, M. routing_id, M. tech_id, M.

1. When installing SQL or SP patches, the system prompts for a pending installation operation, which requires a workaround to restart:Locate HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager in the registry, and delete the

Mathematical functions Serial number function function SQL Server usage Oracle usage 1 Absolute Select ABS ( -1) value Select ABS ( -1) value from dual 2 Rounding (Large)

In MSSQL If you combine the results of two or more queries into a single result set that contains all the rows of all the queries in a federated query, the common method is as follows: I. Use the Union or UNION ALL statement 1. The difference

MS SQL Server Query optimization methodThere are many reasons for the slow speed of queries, which are common1, no indexes, or no indexes (this is the most common problem with query slowness, is the flaw in programming)2, I/o throughput is small,

Note: Sunday is the first day of the week, not the last day of the week () minus one day, such as dateadd (day,-1, getDate () This week: select * fromtablewheredatediff (week, C_CALLTIME, getdat Note: Sunday is the first day of the week, not the

Really do not want to write, but still have to force themselves to learn a little every day, write a little. I didn't play tonight, and when I got home, I was called on the line to deal with things, take some time to learn some Oracle1, character

 Code Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->1 declare @ DT datetime; 2 set @ dt = getdate (); 3 declare @ Table (Caption varchar (20), value datetime ); 4 5 insert into @ table values ('0',