SQLite Interview Questions
An Overview of an SQLite database
SQLite is a database management system which is present in the C programming library. In the term SQLite, lite demonstrates lightweight. It is small highly reliable and fast. SQLite is one of the popular database systems in the world. The SQLite, as the name suggests, is very light in terms of setup, required resources, and data admin. It has some of the features like zero-configuration, serverless and zero-configuration. This information and the information that we are providing through SQLite Interview Questions we are mentioning below will help you get enough of the knowledge about SQLite.
Advantages of SQLite database
- Simply use it. No requirement for any installation and configuration.
- Free for both private and commercial projects.
- It does not require any server like MySQL or PostgreSQL.
- SQLite is a lightweight database even for iPhones and Android Phones.
If you are preparing for the SQLite language job interview, we have one of the biggest collection of SQLite Interview Questions.
SQLite was designed by Dwayne Richard Hipp in the year 2000. SQLite Version 3.6.17 released on August 10, 2009.
The latest version of SQLite is 3.26.0 which got released on 1st December 2018.
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Most Frequently Asked SQLite Interview Questions And Answers With Examples:
- Who developed SQLite and when?
- Why was SQLite designed?
- What are the features of SQLite?
- Explain the difference between SQL and SQLite?
- What are the standard commands in SQLite?
- List down the area where SQLite performs well.
- What are the storage classes in SQLite?
- What are the operators in SQLite?
- Explain how Boolean values are stored in SQLite?
- How to create a database in SQLite?
- What is the role of the Index in SQLite?
- What are the SQLite transactions?
- How to delete or add columns from an existing SQLite table?
- What is the maximum size of an SQLite VARCHAR?
- When to and when not to use SQLite?
- When does SQLITE_SCHEMA error appear?
- How do we use a string literal which contains an embedded single-quote (‘) character?
- What do you mean by the Export Control Classification Number (EECN) in SQLite?
- How to create an AUTOINCREMENT field in SQLite?
- What are the methods to insert data in the SQLite table?
- What is UPDATE query in SQLite?
- How can we delete the existing records for an SQLite table?
- The code for the SQLite is in the public domain therefore SQLite is free to use
- SQLite does not require the server to operate
- SQLite allows the user to work on multiple databases at the same time
- There is no need to install "SQLite" before using it.
- SQLite has the capability of creating the in-memory database, and the user can work very fast with it.
|1.||SQL is server based||SQLite is file base|
|2.||SQL is a query language||SQLite is an embedded database management system|
|3.||SQL supports the stored procedure||SQLite does not support the stored procedure|
This particular SQLite Question and Answer defines explicitly the difference between SQL and SQLite.
Here are some of the areas:-
- Embedded devices
- File archives
- Data Analysis
SQLite storage classes include the following:
- Null: It has a NULL value.
- Integer: The value is a signed integer (5,6,7, etc.)
- Real: The numbers with a decimal point (1.2,3.4 etc.).The real numbers are stored as an 8 byte IEEE floating point number.
- Text: It holds a text string.
- BLOB: The value is a blob of data, and it is stored exactly as it was input.
There are four operators in SQLite:-
- Arithmetic operators(+,-,*,/,%)
- Comparison operators(==,=,!=,<>,<,>,>=,<=,!<,!>
- Logical operators(AND, BETWEEN, EXISTS, IN, NOT IN, LIKE, GLOB, NOT, OR, IS NULL, IS, IS NOT, ||, UNIQUE)
- Bitwise operators(&, I,~,<<,>>)
Point to be noted: Make sure that you go through this Q&A twice as this is the favorite SQLite Questions and Answers for fresher and experienced as well.
SQLite incorporates Boolean as an integer variable rather than having a separate Boolean class. Boolean values are stored in SQLite as integers 0 which means false and 1 which means true.
In SQLite, the transaction is mentioned as a unit of work performed against a database. The properties of a transaction are determined by four factors also called ACID.
- Atomicity: Ensures work of units to be completed successfully.
- Consistency: Ensures the states of database change after every successful transaction.
- Isolation: This enables SQLite transactions to operate independently and transparent to each other.
- Durability: This ensures the effect of committed transactions stays in case of system failure.
This question has always been a center of the discussion in SQLite Interview Question Android
The user has first to save the existing data to a temporary table. Then, then drop the old column or table, create a new table and copy the data back that put in the temporary table. The support for the altar table is minimal.
There is no specific length for VARCHAR in SQLite. Users can declare a VARCHAR(10), and SQLite is capable of storing a 500 million character string there while keeping all the characters intact.
SQLite is a pretty advanced and useful database management system, but as like many there are areas where it standout and regions where it is vulnerable. It can be helpful in conditions like embedded applications, testing and disk assess replacement, whereas it is not advised to use SQLite for multi-user applications and applications requiring high write volumes.
The standard SQL specifies that single-quotes in strings can be escaped by putting two single in a row. In this scenario, it works with the Pascal programming language.
The source code for the core public domain SQLite is not described by any EECN. That’s why the ECCN should be reported here as EAR99. But, we add new code or link SQLite with an application, then it may change the EECN number.
The user has to declare an INTEGER PRIMARY KEY column on the table at first. After this, whenever we insert a NULL into that column of the table, it will automatically be converted into an integer which is one greater than the most considerable value of that column over all the other rows present in the table.
There are two ways to insert data in an SQLite table:
INSERT INTO TABLE_NAME [(column1, column2, column3,...columnN)] VALUES (value1, value2, value3,...valueN);
INSERT INTO TABLE_NAME VALUES (value1,value2,value3,...valueN);
The DELETE can be used in SQLite to delete the existing records from a table. We should use the WHERE clause to modify a specific row otherwise all rows will be removed.
DELETE FROM table_name