Alternatively referred to as a wild character or wildcard character, a wildcard is a symbol used to replace or represent one or more characters. The most common wildcards are the asterisk (*), which represents one or more characters, and question mark (?), which represents a single character. What is difference between * and & wildcard character? Difference between wildcards (*) …
What is the meaning of * * in Python? Why do we use asterisk (*) before name in function definition in Python? If we want to accept only Keyword-Only arguments without any positional arguments, Python allows us to use * in function parameters to achieve this. Let’s see an example. The above function takes only the keyword-only arguments. We have …
COUNT(*) returns the number of rows in a specified table, and it preserves duplicate rows. It counts each row separately. This includes rows that contain null values. What is the use of count (*)? What is the use of * in SQL? The second part of a SQL query is the name of the column you want to retrieve for …
A Binary Large Object ( BLOB ) is a MySQL data type that can store binary data such as images, multimedia, and PDF files. Can a SQL database hold images? The IMAGE data type in SQL Server has been used to store the image files. Recently, Microsoft began suggesting using VARBINARY(MAX) instead of IMAGE for storing a large amount of …
They help us target specific rows to perform various operations in SQL. They are used to SELECT, UPDATE, INSERT and DELETE records in SQL. There are different types of SQL subquery, like Single-row subquery, multiple row subquery, multiple column subquery, correlated subquery, and nested subquery. How many types of subquery are there in SQL? There are three broad types of …
Using built-in DB_NAME() SQL function, developers can get current database name that they are executing their scripts on. How do I find my current database name? Using built-in DB_NAME() SQL function, developers can get current database name that they are executing their scripts on.
Click New SQL Server stand-alone installation or add features to an existing installation. Click Next until you see the Installation Type dialog. Click Add features to an existing instance of SQL Server. Under Database Engine Services, click Full-Text and Semantic Extractions for Search. How do I enable full text and semantic extractions for search? Click New SQL Server stand-alone installation …
From the home screen, right-click on a MySQL connection, choose Edit Connection, and set the desired default schema on the Default Schema box. The selected schema is displayed as bold in the schema navigator. Filter to This Schema: Enables you to target specific schemas in the list. How do I find the schema of a database? You can get a …
In Python, we have many data types. The most common ones are float (floating point), int (integer), str (string), bool (Boolean), list, and dict (dictionary). What is the most used data type in Python? Python contains a number of built-in data types that can be used to store specific types of data. The most commonly used data types in Python …
Error Correction can be handled in two ways: Backward error correction: Once the error is discovered, the receiver requests the sender to retransmit the entire data unit. Forward error correction: In this case, the receiver uses the error-correcting code which automatically corrects the errors. Which technique is used for error correction? The method of detecting and correcting burst errors in …