Describe Table In Sql


Describe Table In Sql

What is the DESC command in SQL?

Conclusion –

DESCRIBE or DESC command in SQL is responsible for showing detailed information about the structure or the schema of a table in a database, such as the names of the columns, datatypes of the columns, and the constraints applied to those columns. It is used to return the basic metadata information of a table like names of columns, datatypes of columns such as VARCHAR, CHAR, INT, FLOAT, TIME, DATE, NUMBER, constraints applied on the columns such as NULL constraint which shows if the column does include null values or not. It can provide additional information by making the use of format, partition_spec, or col_name with the describe command. EXPLAIN command in SQL also works in a similar way as the DESCRIBE command works, and it also generates the same results.

How do I get table details in SQL?

To show table properties in the Properties window –

  1. In Object Explorer, select the table for which you want to show properties.
  2. Right-click the table and select Properties from the shortcut menu. For more information, see Table Properties – SSMS,

How to describe a table in SQL in MySQL?

Conclusion –

  • The DESCRIBE or DESC command in MySQL is a useful way to retrieve information about a table’s structure, including column names, data types, and constraints.
  • To use the DESCRIBE command, you need to log in to the MySQL server, select the database, and execute the command with the name of the table you want to describe.
  • The output of the DESCRIBE command includes columns for the name, type, and nullability of each column in the table.
  • In addition to the DESCRIBE command, you can use the SHOW COLUMNS command to retrieve information about a table’s structure, which provides a more detailed output with additional information.
  • MySQL Workbench provides a convenient GUI for viewing table information, including columns and their details.
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How do you describe a database table?

In this article – Applies to: SQL Server 2016 (13.x) and later Azure SQL Database Azure SQL Managed Instance Azure Synapse Analytics Analytics Platform System (PDW) Tables are database objects that contain all the data in a database. In tables, data is logically organized in a row-and-column format similar to a spreadsheet. Each row represents a unique record, and each column represents a field in the record.

The number of tables in a database is limited only by the number of objects allowed in a database (2,147,483,647). A standard user-defined table can have up to 1,024 columns. The number of rows in the table is limited only by the storage capacity of the server. You can assign properties to the table and to each column in the table to control the data that is allowed and other properties. For example, you can create constraints on a column to disallow null values or provide a default value if a value is not specified, or you can assign a key constraint on the table that enforces uniqueness or defines a relationship between tables. The data in the table can be compressed either by row or by page. Data compression can allow more rows to be stored on a page. For more information, see Data Compression,

What does DESC () do?

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


Conclusion – In SQL, The results of a SELECT statement are sorted using the ORDER BY clause, The results can be sorted using either a single column or many columns. Although ascending is the default sort order, you can select descending order by using the DESC keyword.

How to show table names in SQL query?

How do you find names of all tables in a database is a recent SQL interview question asked to one of my friends. There are many ways to find all table names from any database like MySQL and SQL Server. You can get table names either from INFORMATION_SCHEMA or sys.tables based upon whether you are using MySQL or SQL Server database.

This is not a popular question like when to use truncate and delete or correlated vs noncorrelated subquery which you can expect almost all candidates to prepare well but this is quite common if you are working on any database like MySQL. In this SQL tutorial, we will see examples of getting names of all tables from MySQL and the SQL Server database.

In MySQL, there are two ways to find the names of all tables, either by using the ” show” keyword or by query INFORMATION_SCHEMA, In the case of SQL Server or MSSQL, You can either use sys.tables or INFORMATION_SCHEMA to get all table names for a database.

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What is the DESC Table_Name?

The Table_Name here refers to the name of the table. The Describe command in SQL is used to see the table’s structure. The desc command gives you complete information about the structure we have given to the table while creating it. The database command will help us view the table in the describe tab.

What is DESC in MySQL query?

The DESC is the short form of DESCRIBE command and used to dipslay the information about a table like column names and constraints on column name. SHOW columns from yourTableName command.

How to show tables details in MySQL?

MySQL SHOW TABLES command example – To use the SHOW TABLES command, you need to log on to the MySQL server first.

On opening the MySQL Command Line Client, enter your password. Select the specific database. Run the SHOW TABLES command to see all the tables in the database that has been selected.

What is a description of a table?

From Wikipedia, the free encyclopedia For sortable tables in Wikipedia, see Help:Sorting For information on table syntax in Wikipedia, see Help:Table An example table rendered in a web browser using HTML, A table is an arrangement of information or data, typically in rows and columns, or possibly in a more complex structure. Tables are widely used in communication, research, and data analysis, Tables appear in print media, handwritten notes, computer software, architectural ornamentation, traffic signs, and many other places.

What is opposite of DESC in SQL?

Order By (ASC, DESC) – ORDER BY gives us a way to SORT the result set by one or more of the items in the SELECT section. Here is an SQL sorting the students by FullName in descending order. The default sort order is ascending (ASC) but to sort in the opposite order (descending) you use DESC.

  1. Here’s the query SELECT studentID, FullName, sat_score FROM student ORDER BY FullName DESC; And here’s the resulting data, presented in a nice descending table.
  2. | studentID | FullName | sat_score | +-+-+-+ | 2 | Teri Gutierrez | 800 | | 3 | Spencer Pautier | 1000 | | 6 | Sophie Freeman | 1200 | | 9 | Raymond F.

Boyce | 2400 | | 1 | Monique Davis | 400 | | 4 | Louis Ramsey | 1200 | | 7 | Edgar Frank “Ted” Codd | 2400 | | 8 | Donald D. Chamberlin | 2400 | | 5 | Alvin Greene | 1200 | +-+-+-+ 9 rows in set (0.00 sec) Here is the UN-ORDERED, current, full student list to compare to the above.

SELECT studentID, FullName, sat_score, rcd_updated FROM student; +-+-+-+-+ | studentID | FullName | sat_score | rcd_updated | +-+-+-+-+ | 1 | Monique Davis | 400 | 2017-08-16 15:34:50 | | 2 | Teri Gutierrez | 800 | 2017-08-16 15:34:50 | | 3 | Spencer Pautier | 1000 | 2017-08-16 15:34:50 | | 4 | Louis Ramsey | 1200 | 2017-08-16 15:34:50 | | 5 | Alvin Greene | 1200 | 2017-08-16 15:34:50 | | 6 | Sophie Freeman | 1200 | 2017-08-16 15:34:50 | | 7 | Edgar Frank “Ted” Codd | 2400 | 2017-08-16 15:35:33 | | 8 | Donald D.

Chamberlin | 2400 | 2017-08-16 15:35:33 | | 9 | Raymond F. Boyce | 2400 | 2017-08-16 15:35:33 | +-+-+-+-+ 9 rows in set (0.00 sec) As with all of these SQL things there is MUCH MORE to them than what’s in this introductory guide. I hope this at least gives you enough to get started.

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What are the two uses of DESC in SQL?

Home Interview Questions Database SQL

Answer : DESC has two purposes. It is used to describe a schema as well as to retrieve rows from table in descending order. Explanation : The query SELECT * FROM EMP ORDER BY ENAME DESC will display the output sorted on ENAME in descending order.

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How to use DESC with WHERE clause in SQL?

The SQL ORDER BY Clause – The SQL ORDER BY clause is used to sort the data in either ascending or descending order, based on one or more columns. This clause can sort data by a single column or by multiple columns. Sorting by multiple columns can be helpful when you need to sort data hierarchically, such as sorting by state, city, and then by the person’s name.

Some databases sort the query results in an ascending order by default. To sort the data in ascending order, we use the keyword ASC, To sort the data in descending order, we use the keyword DESC,

In addition to sorting records in ascending order or descending order, the ORDER BY clause can also sort the data in a database table in a preferred order. This preferred order may not sort the records of a table in any standard order (like alphabetical or lexicographical), but they could be sorted based on external condition(s).

What is an example of a DESC?

RESPONDING ASSERTIVELY USING A DESC RESPONSE: Example: ‘ I feel attacked and defensive.’ Specifies the desired change in behavior. understand my role in this.’ Or Specifies the effect the behavior had on you and others. Example: ‘Your shouting disrupts our co-workers and our ability to focus on our customers.’

What are the two uses of DESC in SQL?

Home Interview Questions Database SQL

Answer : DESC has two purposes. It is used to describe a schema as well as to retrieve rows from table in descending order. Explanation : The query SELECT * FROM EMP ORDER BY ENAME DESC will display the output sorted on ENAME in descending order.

Interview Candidate Mar 6th, 2005 7 37790

SQL Answer

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Showing Answers 1 – 7 of 7 Answers