The second part of a SQL query is the name of the column you want to retrieve for each record you are getting. You can obviously retrieve multiple columns for each record, and (only if you want to retrieve all the columns) you can replace the list of them with * , which means “all columns”. What does the asterisk …
The wildcard selector literally means any descendant of the preceding selector. So given a selector like div#nav * would match any elements that are nested with a element, but not the element itself. Let me show you a useful example. What is the purpose of * In selector? Answer: A selector is one of the properties of the object that …
Wildcards are symbols used in database searchs to represent a letter or letters in a word. Wildcards can be useful when searching for information because they enable different forms or spelling of a word to be searched similtaneously. What are wildcards how are they useful? Wildcards are special characters that can stand in for unknown characters in a text value …
A statement is the general term for a piece of complete, correct SQL that you can send to a DBMS. A query is a statement that will return data, thus a query is a special kind of statement. A SELECT … would be a query, a DELETE… just a statement. What are the four main query statements? In Data Manipulation …
There are two types of SQL comments: simple comments. Simple comments are introduced by two consecutive hyphens (–) and end with the end of line. bracketed comments. What is the comment tag in SQL? A comment can appear between any keywords, parameters, or punctuation marks in a statement. You can include a comment in a statement in two ways: Begin …
To check your Python version, run python ‐‐version in your command line (Windows), shell (Mac), or terminal (Linux/Ubuntu). To check your Python version in your script, run import sys to get the module and use sys. version to find detailed version information in your code. Which command will you use to check the Python? Check Python version on the command …
An error is something you have done which is considered to be incorrect or wrong, or which should not have been done. Collins COBUILD Advanced Learner’s Dictionary. What is basic error? An error is something you have done which is considered to be incorrect or wrong, or which should not have been done. Collins COBUILD Advanced Learner’s Dictionary. What are …
The default user for MySQL is root and by default it has no password. If you set a password for MySQL and you can’t recall it, you can always reset it and choose another one. What is root password in MySQL example? Configuring a default root password for MySQL/MariaDB Use the following procedure to set a root password. To change …
There are 3 main types of commands. DDL (Data Definition Language) commands, DML (Data Manipulation Language) commands, and DCL (Data Control Language) commands. What are the three types of SQL? SQL Commands can be grouped into following depending on their functionality: DDL (Data Definition Language) DML (Data Manipulation Language) TCL (Transaction Control Language) What is DDL DML and DCL? DCL …
