Today, I learned SQL.
SQL: A table is the principal unit of storage in database. It is a two-dimensional container for data that consists of records (rows); each record has the same number of columns. These columns are called fields, which contain the actual data. Each table will have a primary key -- a field (or sometimes combination of fields) that is used to uniquely identify each record in a table.
These are the table relationship in SQL.
String Data Types
Numeric Data Types
Date and Time Data Types
These are the important SQL keywords.
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