The ADD CONSTRAINT keyword is used to define a new constraint on a table, which enforces rules on the data in that table to maintain data integrity and consistency.

The ALL keyword is used in SQL to specify that a condition should apply to all values in a set, often used with aggregate functions to return results that meet the criteria across all records.

The ALTER keyword is used to modify the structure of an existing database object, such as a table. It allows users to add, delete, or change columns and constraints within the table.

The ALTER COLUMN keyword is used to modify the definition of an existing column in a table, such as changing its data type, size, or constraints.

The ALTER TABLE keyword is used to modify an existing table structure in a database. This can include adding, deleting, or modifying columns, as well as changing constraints or other properties of the table.

The AND keyword is used in SQL to combine multiple conditions in a WHERE clause, ensuring that all specified conditions must be true for a record to be included in the result set.

The ANY keyword is used in SQL to compare a value to any value in a list or a subquery result. It allows for flexible comparisons, enabling the retrieval of records that meet certain criteria based on multiple potential matches.

The AS keyword is used to create an alias for a table or a column in a SQL query, allowing for easier reference and improved readability in the results.

The ASC keyword is used to specify the sorting order of the results in ascending order when retrieving data from a database.

The BACKUP DATABASE keyword is used to create a copy of a database, preserving its data and structure, which can be used for recovery purposes in case of data loss or corruption.

The BETWEEN keyword is used in SQL to filter the result set within a specified range. It can be applied to numeric, date, or text values, allowing users to retrieve records that fall within the defined lower and upper bounds.

The CASE keyword is used to create conditional logic within SQL statements, allowing for the evaluation of conditions and the return of specific values based on those conditions.

The CHECK keyword is used to impose a condition on the values that can be inserted or updated in a column of a table, ensuring that only data that meets the specified criteria is allowed.

The COLUMN keyword is used in SQL to specify a particular column in a table, often in conjunction with other commands to define, modify, or retrieve data related to that column.

The CONSTRAINT keyword is used to define rules or limitations on the data in a table, ensuring data integrity and enforcing specific conditions on the values that can be stored in the table's columns.

The CREATE keyword is used to create new database objects, such as tables, views, indexes, or databases, defining their structure and properties.

The CREATE DATABASE keyword is used to create a new database in a SQL server, allowing users to store and manage data within that database.

The CREATE INDEX keyword is used to create an index on one or more columns of a table, which improves the speed of data retrieval operations by allowing the database to find rows more efficiently.

The CREATE OR REPLACE VIEW keyword is used to create a new view or update an existing view in a database. A view is a virtual table that provides a way to present data from one or more tables in a specific format or structure without storing the data physically.

The CREATE PROCEDURE keyword is used to define a new stored procedure in a database. A stored procedure is a set of SQL statements that can be executed as a single unit, allowing for reusable and modular code.

The CREATE TABLE keyword is used to create a new table in a database, defining its structure by specifying the table name and the columns along with their data types and constraints.

The CREATE UNIQUE INDEX keyword is used to create a unique index on one or more columns of a table, ensuring that the values in those columns are distinct across all rows in the table. This helps maintain data integrity by preventing duplicate entries in the specified columns.

The CREATE VIEW keyword is used to define a virtual table based on the result set of a SELECT query. This allows users to simplify complex queries, encapsulate logic, and present data in a specific format without storing the data physically.

The DATABASE keyword is used to create, select, or manage a database within a database management system, allowing users to organize and store data efficiently.

The DEFAULT keyword is used to specify a default value for a column in a table when no value is provided during an insert operation.

The DELETE keyword is used to remove existing records from a table based on specified conditions.

The DESC keyword is used to sort the result set of a query in descending order, typically applied to a specific column in a SELECT statement.

The DISTINCT keyword is used in SQL to eliminate duplicate rows from the result set of a query, ensuring that only unique values are returned.

The DROP keyword is used to remove an entire table, view, index, or database from the database management system, permanently deleting all associated data and structure.

The DROP COLUMN keyword is used to remove an existing column from a table in a database.

The DROP CONSTRAINT keyword is used to remove a constraint from a table, which can include primary keys, foreign keys, unique constraints, or check constraints, thereby altering the rules that govern the data within that table.

The DROP DATABASE keyword is used to permanently remove an entire database and all of its associated data, tables, and objects from the database management system.

The DROP DEFAULT keyword is used to remove the default value assigned to a column in a table. This means that if no value is provided for that column during an insert operation, the column will no longer automatically receive the previously defined default value.

The DROP INDEX keyword is used to remove an existing index from a database table, which can help improve performance by reducing the overhead associated with maintaining the index during data modifications.

The DROP TABLE keyword is used to delete an entire table and all of its data from a database permanently.

The DROP VIEW keyword is used to remove an existing view from the database.

The EXEC keyword is used to execute a stored procedure or a dynamic SQL statement in a database management system.

The EXISTS keyword is used in SQL to test for the existence of any records in a subquery. It returns true if the subquery returns one or more rows, and false if it returns no rows.

The FOREIGN KEY keyword is used to establish a relationship between two tables by linking a column in one table to the primary key of another table, ensuring referential integrity.

The FROM keyword is used to specify the table or tables from which to retrieve data in a SQL query.

The FULL OUTER JOIN keyword is used to combine rows from two or more tables based on a related column, returning all records from both tables. When there is no match, NULL values are returned for the columns of the table that lacks a corresponding row.

The GROUP BY keyword is used in SQL to arrange identical data into groups, allowing for the aggregation of values within those groups using functions like COUNT, SUM, AVG, etc.

The HAVING keyword is used to filter records that work on summarized group data in SQL, typically in conjunction with the GROUP BY clause.

The IN keyword is used in SQL to specify multiple values in a WHERE clause, allowing for filtering records that match any of the specified values in a list.

The INDEX keyword is used to create an index on a database table, which improves the speed of data retrieval operations by providing a quick lookup mechanism for specific columns.

The INNER JOIN keyword is used to combine rows from two or more tables based on a related column between them, returning only the rows that have matching values in both tables.

The INSERT INTO keyword is used to add new rows of data into a specified table in a database.

The INSERT INTO SELECT keyword is used to insert data into a table by selecting it from another table. This allows for the copying of data from one table to another in a single operation.

The IS NOT NULL keyword is used in SQL to filter query results by excluding rows that contain NULL values in a specified column.

The IS NULL keyword is used in SQL to check whether a specified column or expression has a NULL value, which indicates the absence of any data.

The JOIN keyword is used to combine rows from two or more tables based on a related column between them, allowing for the retrieval of data that spans multiple tables in a relational database.

The LEFT JOIN keyword is used to combine rows from two or more tables based on a related column, returning all records from the left table and the matched records from the right table. If there is no match, NULL values are returned for columns from the right table.

The LIKE keyword is used in SQL to search for a specified pattern in a column. It allows for wildcard characters, such as '%' for any sequence of characters and '_' for a single character, enabling flexible string matching in queries.

The LIMIT keyword is used to specify the maximum number of records to return in a query result, allowing for the control of the output size and improving performance by restricting the amount of data processed.

The NOT keyword is used in SQL to negate a condition in a query, often in conjunction with other operators such as WHERE, to filter out records that do not meet specified criteria.

The NOT NULL keyword is used to specify that a column in a database table cannot contain NULL values, ensuring that every record must have a valid entry for that column.

The OR keyword is used in SQL to combine multiple conditions in a WHERE clause, allowing for the selection of records that meet at least one of the specified conditions.

The ORDER BY keyword is used to sort the result set of a query by one or more columns in either ascending or descending order.

The OUTER JOIN keyword is used to combine rows from two or more tables based on a related column, including all records from one table and the matched records from the other table, filling in with NULLs where there is no match.

The PRIMARY KEY keyword is used to uniquely identify each record in a database table, ensuring that no two rows have the same value in the specified column(s) and enforcing entity integrity.

The PROCEDURE keyword is used to define a stored procedure in SQL, which is a set of precompiled SQL statements that can be executed as a single unit to perform a specific task or operation within a database.

The RIGHT JOIN keyword is used to combine rows from two or more tables based on a related column, returning all records from the right table and the matched records from the left table. If there is no match, NULL values are returned for columns from the left table.

The ROWNUM keyword is used in Oracle SQL to assign a unique sequential integer to each row returned by a query, starting from 1 for the first row. It is often used to limit the number of rows returned in a result set or to filter results based on their position in the output.

The SELECT keyword is used to retrieve data from one or more tables in a database. It allows users to specify which columns to display and can include conditions to filter the results.

The SELECT DISTINCT keyword is used to retrieve unique values from a specified column or columns in a database table, eliminating duplicate entries from the result set.

The SELECT INTO keyword is used to create a new table and populate it with data retrieved from an existing table.

The SELECT TOP keyword is used to specify the number of records to return from a query, allowing users to limit the result set to a specified number of rows, often used for performance optimization or to retrieve a sample of data.

The SET keyword is used to assign a value to a variable or to update existing records in a table during an UPDATE statement.

The TABLE keyword is used to define a database table structure, specifying the name of the table and its associated columns and data types.

The TOP keyword is used in SQL to limit the number of rows returned in a query result set, allowing users to specify a specific number or percentage of rows to retrieve from a table.

The TRUNCATE TABLE keyword is used to delete all rows from a table quickly and efficiently, while preserving the table structure for future use.

The UNION keyword is used to combine the results of two or more SELECT statements into a single result set, eliminating duplicate rows in the process.

The UNION ALL keyword is used to combine the results of two or more SELECT queries, including all duplicate rows from the combined result set.

The UNIQUE keyword is used to ensure that all values in a specified column or a group of columns are distinct from one another, preventing duplicate entries in a table.

The UPDATE keyword is used to modify existing records in a table by changing the values of one or more columns for specified rows.

The VALUES keyword is used to specify the data that will be inserted into a table in an SQL INSERT statement. It allows you to define one or more rows of data to be added to the specified columns of the table.

The VIEW keyword is used to create a virtual table in a database that is based on the result of a SELECT query. It allows users to simplify complex queries, encapsulate logic, and present data in a specific format without storing the data physically.

The WHERE keyword is used to filter records in a SQL query, allowing you to specify conditions that must be met for the records to be included in the result set.