How do I comment in MySQL?

In MySQL, a comment that starts with /* symbol and ends with */ and can be anywhere in your SQL statement. This method of commenting can span several lines within your SQL.

How do you give a comment in SQL?

How do I comment out a line in SQL Workbench?

How do I add comments to a table in MySQL?

How delete a column in SQL?

Right-click the column you want to delete and choose Delete Column from the shortcut menu. If the column participates in a relationship (FOREIGN KEY or PRIMARY KEY), a message prompts you to confirm the deletion of the selected columns and their relationships. Choose Yes.

How many tables can be join in SQL query?

Theoretically, there is no upper limit on the number of tables that can be joined using a SELECT statement. (One join condition always combines two tables!) However, the Database Engine has an implementation restriction: the maximum number of tables that can be joined in a SELECT statement is 64.

How do I sort in MySQL?

The ORDER BY keyword is used to sort the result-set in ascending or descending order. The ORDER BY keyword sorts the records in ascending order by default. To sort the records in descending order, use the DESC keyword.

How do you delete a database in MySQL?

Deleting a MySQL or MariaDB database

Use the command ‘SHOW DATABASES;’ in the mysql-console like in the example above. Now copy the name of the database you want to delete. To do delete a database you need the command ‘DROP DATABASE’. The syntax is similar to creating a database.

How do you create a new database in MySQL?

Open the MySQL Workbench as an administrator (Right-click, Run as Admin). Click on File>Create Schema to create the database schema. Enter a name for the schema and click Apply. In the Apply SQL Script to Database window, click Apply to run the SQL command that creates the schema.

How can I see the tables in a MySQL database?

How do I drop a table in MySQL?

DROP TABLE MySQL Command Syntax. To remove a table in MySQL, use the DROP TABLE statement. The basic syntax of the command is as follows: DROP [TEMPORARY] TABLE [IF EXISTS] table_name [, table_name] [RESTRICT | CASCADE];

How do I export a SQL developer query?

How do I create a subquery in SQL?

How do I create a unique key in MySQL?

Sometimes we want to add a unique key to the column of an existing table; then, this statement is used to add the unique key for that column. Following are the syntax of the ALTER TABLE statement to add a unique key: ALTER TABLE table_name ADD CONSTRAINT constraint_name UNIQUE(column_list);

How do you comment in SQL?

How do I import a .SQL file into MySQL?

How do I install MySQL on Windows 10?

How do I delete a database in MySQL?

Deleting a MySQL or MariaDB database

Use the command ‘SHOW DATABASES;’ in the mysql-console like in the example above. Now copy the name of the database you want to delete. To do delete a database you need the command ‘DROP DATABASE’. The syntax is similar to creating a database.

How do I create a recursive query in MySQL?

AS ( subquery ) Select col1, col2, .. from cte_name; cte_name: Name given to recursive subquery written in subquery block. col1, col2, … colN: The name given to columns generated by subquery. subquery: A MySql query that refer to itself using cte_name as its own name.

How do you write a view?

To create a view, a user must have the appropriate system privilege according to the specific implementation. CREATE VIEW view_name AS SELECT column1, column2….. FROM table_name WHERE [condition]; You can include multiple tables in your SELECT statement in a similar way as you use them in a normal SQL SELECT query.

What is virtual table in SQL?

A virtual table is an object that presents an SQL table interface but which is not stored in the database file, at least not directly. The virtual table mechanism is a feature of SQLite that allows SQLite to access and manipulate resources other than bits in the database file using the powerful SQL query language.