Microsoft SQL Server software is bundled with exceptional features. Whenever we begin typing queries, SQL Server automatically starts suggesting you the schema names, table name and columns. Many more suggestions are offered to make developers' work easy. All these suggestions and auto-completes are nothing but SQL Server's Intelligence cache feature.
Counting the number of characters or size of a string in SQL Server is possible with LEN and DATALENGTH function. Both these functions are used interchangeably. While we need to be careful while using these functions in production code. Basically, both the function sounds similar although each has a distinct purpose.
Constraints in SQL database maintains data integrity and accuracy. SQL Default Constraint is used to assign a default value to a column when no value is specified. Using Default constraint we can have a meaningful value instead of storing NULL or Empty value. It reduces the presence of NULLs when applicable by improving data consistency.
CONCAT_WS, a string Concatenation function With Separator (WS). A fresh addition to SQL Server 2017. CONCAT_WS function takes multiple string arguments (at least two) and separator as an input. Furthermore, joins multiple strings together into a single string – connected by a Separator. While CONCAT_WS is an extension to CONCAT function with an added separator.
Programming languages have objects that rely on another object. A rather similar principle applies to a database. Multiple types of object dependencies exist in a database including relationships between tables, primary-foreign keys, constraints and schema bindings. Therefore Object dependencies become critical in a growing database and have to be handled with caution.