SQLite Interview Questions and Answers

Indexes are the lookup tables which are used by the database Engines to speed up the process of retrieving of the data. We can say that the Index is a pointer to the data in a table.

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

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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.

This error appears when a prepared SQL statement is not valid and can’t be executed. This error usually occurs when we use the sqlite3 step() and sqlite3 prepare() interfaces to run SQL.

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:

1. INSERT INTO TABLE_NAME [(column1, column2, column3,...columnN)] VALUES (value1, value2, value3,...valueN);

2. INSERT INTO TABLE_NAME VALUES (value1,value2,value3,...valueN);