sql
Databases In SQL
The software used to store, manage, query, and retrieve data stored in a relational database is called a relational database management system (RDBMS). The RDBMS provides an interface between users and applications and the database, as well as administrative functions for managing data storage, access, and performance.
Select Statements
To fully use the power of a relational database we need to communicate with it. The ultimate communication would be to turn to our computer and say, in a clear, distinct voice, `Show me all the left-handed, brown- eyed bean counters who have worked for this company for at least 10 years.`A few of us may already be doing so (talking to our computer, not listing bean counters). Everyone else needs a more conventional way of retrieving information from the database.
Posted August 9, 2022 by Anusha ‐ 5 min read
Syntax in SQL
SQL is followed by a unique set of rules and guidelines called Syntax. All the SQL statements start with any of the keywords like SELECT, INSERT, UPDATE, DELETE, ALTER, DROP, CREATE, USE, SHOW and all the statements end with a semicolon (;).
Data Types in SQL
Data types are used to represent the nature of the data that can be stored in the database table. For example, in a particular column of a table, if we want to store a string type of data then we will have to declare a string data type of this column.
Operators in SQL
The SQL reserved words and characters are called operators, which are used with a WHERE clause in a SQL query. In SQL, an operator can either be a unary or binary operator. The unary operator uses only one operand for performing the unary operation, whereas the binary operator uses two operands for performing the binary operation.