Dec 16, 2009 · 23 The pure RDBMS layers of Oracle and MSSQL offer mainly a more mature programmable environment than MySQL and InnoDB. T-SQL and PL/SQL can't be yet matched by …

Nov 21, 2009 · We use Oracle on a project and would like to also support MySQL. How close are their SQL dialects? Is it perhaps even possible to use the same SQL source for both without too many …

SQL is a declarative language to operate on relational data: tables, views, resultsets and similar. It's more or less standardized, and used by almost all relational database management systems: SQL …

Jul 8, 2022 · When dealing with big databases, which performs better: IN or OR in the SQL WHERE clause? Is there any difference about the way they are executed?

Nov 25, 2009 · I'm an Oracle guy myself, yet sometimes I find it hard to argue its use over PostgeSQL or even MySQL. The short story is that there are companies/projects out there that manage huge …

It seems to me that you can do the same thing in a SQL query using either NOT EXISTS, NOT IN, or LEFT JOIN WHERE IS NULL. For example: SELECT a FROM table1 WHERE a NOT IN (SELECT a …

Jun 24, 2016 · Oracle will have you add primary and foreign keys as constraints, separate from the table definition. PostgreSQL is the closest thing to Oracle among the open source databases.

Is there any difference for same in Mysql and PostgresSQL? No it would not have any difference on the two engines (Infact it would be same for most of the databases including SQL Server, Oracle etc). …

Feb 13, 2009 · This is a copy/paste of another answer of mine for question SQL 'like' vs '=' performance: A personal example using mysql 5.5: I had an inner join between 2 tables, one of 3 million rows and …

Dec 15, 2015 · Rowid gives the address of rows or records. Rownum gives a count of records Rowid is permanently stored in the database. Rownum is not stored in the database permanently Rowid is …