Which of the following data type holds a string with maximum length of 255 characters?
Stores strings of letters, numbers, and symbols. Data types Show
Character data can be stored as fixed-length or variable-length strings. Fixed-length strings are right-extended with spaces on output; variable-length strings are not extended. String literals in SQL statements must be enclosed in single quotes. SyntaxCHAR { CHAR | CHARACTER } [ (octet‑length) ] VARCHAR { VARCHAR | CHARACTER VARYING ] } [ (octet‑length) ]
Parameters
CHAR Versus VARCHAR Data TypesThe following differences apply to CHAR and VARCHAR data:
Normally, you use Setting Maximum LengthWhen you define character columns, specify the maximum size of any string to be stored in a column. For example, to store strings up to 24 octets in length, use one of the following definitions: CHAR(24) /* fixed-length */ VARCHAR(24) /* variable-length */ The maximum length parameter for Remember to include the extra octets required for multibyte characters in the column-width declaration, keeping in mind the 65000 octet column-width limit. Due to compression in Vertica, the cost of overestimating the length of these fields is incurred primarily at load time and during sorts. NULL Versus NULNULL and NUL differ as follows:
NULL appears last (largest) in ascending order. For additional information about NULL ordering, see NULL Sort Order. The following example casts the input string containing NUL values to VARCHAR: => SELECT 'vert\0ica'::CHARACTER VARYING AS VARCHAR; VARCHAR --------- vert\0ica (1 row) The result contains 9 characters: => SELECT LENGTH('vert\0ica'::CHARACTER VARYING); length -------- 9 (1 row) If you use an extended string literal, the length is 8 characters: => SELECT E'vert\0ica'::CHARACTER VARYING AS VARCHAR; VARCHAR --------- vertica (1 row) => SELECT LENGTH(E'vert\0ica'::CHARACTER VARYING); LENGTH -------- 8 (1 row) Himanshi Singh — Published On November 10, 2020 and Last Modified On November 19th, 2020 Overview
IntroductionDatabases are ubiquitous – from social media and sports to e-commerce and movies you watch online, databases are at the core of everything. For managing, retrieving, storing, and manipulating these databases we have Database Management Systems(DBMS). There are plenty of DBMSs available in the market to manage this much data- MySQL, PostgreSQL, SQLite, Oracle Database, Apache CouchDB, etc. Each DBMS provides its own data types with a little modification than others but the basic idea is the same. Today I’ll cover the data types provided by MySQL DBMS. The data types in MySQL are divided into three broad categories. I’ll cover each one in detail to give you a clear sense of them so that you can know where and how can you use them. Without further delay let’s get started. Table of Contents
What is a Data Type?A data type as the name suggests is the type or category to which the data belongs to. It is an attribute of the data which defines the type of data an object can hold. In SQL the data type defines the type of data to be stored in each column of the table. Each column has its own data type. It is important to specify the data type of all columns so that similar values can be added to it. This means one column can hold only one type of data. The data type is specified while creating the structure of the table. For example- CREATE TABLE table_name (
column1 datatype,
column2 datatype,
column3 datatype,
); For instance, you want to create a Student Table, then this is how you can create it- CREATE TABLE Student ( Roll_no int, Name char(50), Age int, ); Here we have specified that the column Roll_no and Age will hold only integer values and the column Name will hold character values. Just like int and varchar, we saw in the example, MySQL provides many types of data types which have been categorized into 3 broad categories. Let’s look into each one of them. 1 – String/Character Data types in MySQL
2 – Numeric Data types in MySQL
3 – Date and Time Data types in MySQL
Sample TableThis table has a combination of all three types of datatypes: CREATE TABLE Student (Admission_Id Varchar(10), Class Tinyint(2), Class_Roll_No Int, Firstname Varchar(50), Lastname Varchar(50), Age Tinyint, DOB Date, Year_of_Admission Year); INSERT into Student values ('AB121', 10, 1, 'Abhay', 'Singh', 16, '2004-05-11', '04'); INSERT into Student values ('AB152', 10, 2, 'Aryan', 'Verma', 15, '2005-11-13', '2005'); INSERT into Student values ('AB233', 10, 3, 'Ayat', 'Khan', 16, '2004-03-10', '2006'); SELECT * from Student; End NotesI’ve covered some famous and common data types that MySQL provides. There are other advanced datatypes as well which will be covered in another article. I recommend you go through the following resources to enhance your understanding of SQL-
I hope now you have a clear understanding of the datatypes in MySQL covered in this article. Thanks for reading! Which data type holds 255 characters?Alphanumeric data (names, titles, etc.) Up to 255 characters. Large amounts of alphanumeric data: sentences and paragraphs. See The Memo data type is now called “Long Text” for more information on the Long Text details.
Is VARCHAR 255 the max?The effective maximum length of a VARCHAR is subject to the maximum row size (65,535 bytes, which is shared among all columns) and the character set used. Make sure you are aware of the effects of a multi-byte character set. VARCHAR(255) stores 255 characters, which may be more than 255 bytes.
What data type with a maximum length of 255 characters can accept letters numbers spaces and punctuation marks?The Text field is one of the most generic and common data entry fields used to capture text type data—letters, numbers, and symbols. Text fields hold up to 255 characters in a single line.
Can the database store the text larger than 255 symbols?Short Text In Access web apps the Short Text field is set to store 255 characters by default, but you can adjust the Character Limit property all the way up to 4000 characters. Its SQL Server equivalent is nvarchar, with length from 1 to 4000.
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