You asked: What is the use of describe in SQL?

The DESCRIBE command enables you to describe objects recursively to the depth level set in the SET DESCRIBE command. You can also display the line number and indentation of the attribute or column name when an object contains multiple object types.

What is describe in SQL?

As the name suggests, DESCRIBE is used to describe something. Since in database we have tables, that’s why we use DESCRIBE or DESC(both are same) command to describe the structure of a table. Syntax: DESCRIBE one; OR DESC one; Note : We can use either DESCRIBE or DESC(both are Case Insensitive).

What is the use of describe table?

Use the DESCRIBE statement to get information about an internal table such as number of lines in an itab. This statement captures several properties of an internal table and assigns them to the specified variables, such LINES, KIND, OCCURS.

What is the purpose of using DESC command?

The DESC command is used to sort the data returned in descending order.

What is describe table in MySQL?

DESCRIBE means to show the information in detail. Since we have tables in MySQL, so we will use the DESCRIBE command to show the structure of our table, such as column names, constraints on column names, etc. The DESC command is a short form of the DESCRIBE command.

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What type of join is needed?

What type of join is needed when you wish to include rows that do not have matching values? Explanation:OUTER JOIN is the only join which shows the unmatched rows. 2.

What table means?

A table is an arrangement of data in rows and columns, or possibly in a more complex structure. Tables are widely used in communication, research, and data analysis.

How do you write a select query?

The SQL SELECT Statement

  1. SELECT column1, column2, … FROM table_name;
  2. SELECT * FROM table_name;
  3. Example. SELECT CustomerName, City FROM Customers;
  4. Example. SELECT * FROM Customers;

How do you describe a table in SQL?

SQL DESCRIBE TABLE is a SQL statement that is accountable for telling something about a specific table in the database. If we want to show the structure of a database table or tables in the server then, we will use the SQL command DESCRIBE or other keyword DESC which is identical to DESCRIBE one.

What are the DML commands?

Some commands of DML are:

  • SELECT – retrieve data from the a database.
  • INSERT – insert data into a table.
  • UPDATE – updates existing data within a table.
  • DELETE – deletes all records from a table, the space for the records remain.
  • MERGE – UPSERT operation (insert or update)
  • CALL – call a PL/SQL or Java subprogram.

Why as clause is used in SQL?

SQL AS keyword is used to give an alias to table or column names in the queries. In this way, we can increase the readability and understandability of the query and column headings in the result set.

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How do you describe a database?

A database is a collection of information that is organized so that it can be easily accessed, managed and updated. Computer databases typically contain aggregations of data records or files, containing information about sales transactions or interactions with specific customers.

How do I display a table in SQL?

Then issue one of the following SQL statement:

  1. Show all tables owned by the current user: SELECT table_name FROM user_tables;
  2. Show all tables in the current database: SELECT table_name FROM dba_tables;
  3. Show all tables that are accessible by the current user:

How do I view a table in SQL?

Right-click the Products table in SQL Server Object Explorer, and select View Data. The Data Editor launches. Notice the rows we added to the table in previous procedures. Right-click the Fruits table in SQL Server Object Explorer, and select View Data.

How do I select a table in MySQL?

MySQL – Select Query

  1. You can use one or more tables separated by comma to include various conditions using a WHERE clause, but the WHERE clause is an optional part of the SELECT command.
  2. You can fetch one or more fields in a single SELECT command.
  3. You can specify star (*) in place of fields.
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