Useful tips for everyday
How do you write coalesce in SQL? The SQL COALESCE function can be syntactically represented using the CASE expression. For example, as we know, the…
Does order matter in composite primary key? The order of primary key columns isn’t a performance consideration for queries that specify all columns of the…
Is primary key Autoincrement? AUTO INCREMENT Field Auto-increment allows a unique number to be generated automatically when a new record is inserted into a table.…
What is alter database? ALTER DATABASE enables you to change the overall characteristics of a database. These characteristics are stored in the data dictionary. This…
How do I check my SSIS package-protection level? In the properties pane of your SSIS project, you will find the security section. There are only…
How many indexes can a table have MySQL? 16 indexes In general, MySQL only allows you to create up to 16 indexes on a given…
Can I use ORDER BY in subquery? An ORDER BY command cannot be used in a subquery, although the main query can use an ORDER…
How do you start an ER diagram? Below points show how to go about creating an ER diagram. Identify all the entities in the system.…
What is party data model? The Party data model defines who you have trading relationships with and how. For example, customer & supplier information along…
What is RAC in Oracle 11g? Oracle Real Application Clusters (RAC) allow customers to run a single Oracle Database across multiple servers in order to…