SQL DEFAULT Constraint - W3Schools
SQL DEFAULT Constraint. The DEFAULT constraint is used to set a default value for a column. The default value will be added to all new records, if no other value is specified.
MySQL DEFAULT Constraint - W3Schools
MySQL DEFAULT Constraint. The DEFAULT constraint is used to set a default value for a column. The default value will be added to all new records, if no other value is specified.
SQL Data Types for MySQL, SQL Server, and MS Access - W3Schools
An SQL developer must decide what type of data that will be stored inside each column when creating a table. The data type is a guideline for SQL to understand what type of data is expected inside of each column, and it also identifies how SQL will interact with the stored data.
SQL INNER JOIN - W3Schools
INNER is the default join type for JOIN, so when you write JOIN the parser actually writes INNER JOIN.
SQL Tutorial - W3Schools
SQL is a standard language for storing, manipulating and retrieving data in databases. Our SQL tutorial will teach you how to use SQL in: MySQL, SQL Server, MS Access, Oracle, Sybase, Informix, Postgres, and other database systems.
SQL ORDER BY Keyword - W3Schools
The ORDER BY keyword sorts the records in ascending order by default. To sort the records in descending order, use the DESC keyword.
SQL CASE Expression - W3Schools
The SQL CASE Expression. The CASE expression goes through conditions and returns a value when the first condition is met (like an if-then-else statement). So, once a condition is true, it will stop reading and return the result. If no conditions are true, it …
SQL ALTER TABLE Statement - W3Schools
SQL ALTER TABLE Statement. The ALTER TABLE statement is used to add, delete, or modify columns in an existing table. The ALTER TABLE statement is also used to add and drop various constraints on an existing table.
SQL UNION Operator - W3Schools
SQL UNION Example. The following SQL statement returns the cities (only distinct values) from both the "Customers" and the "Suppliers" table:
SQL COUNT() Function - W3Schools
The SQL COUNT() Function. The COUNT() function returns the number of rows that matches a specified criterion.