The result set will have three columns, column1, Two and Three — where Two contains values from table1.column2 and table2.column4 and Three contains values from table1.column3 and table2.column5.

SQL is the leading language for developing and querying databases, but it has a few quirks.In my last article, I shared 7 SQL mistakes to avoid.Now, let’s take a look at 9 best practices for ...

Oracle, SQL Server and DB2 have special, but inconsistent, syntax for these hierarchical queries, while MySQL and PostgreSQL lack specific support. To make the situation worse, the World Wide Web and ...