45+ SQLite Interview Questions

45+ SQLite Interview Questions

SQLite Interview Questions

1) What is SQLite? 

SQLite is a social database the executives framework which is independent, server-less and need zero setup.

2) Who was the planner of SQLite? 

SQLite was structured by D. Richard Hipp with the end goal of no organization required for working a program.


3) What are the most vital highlights of SQLite? 

There are bunches of highlights which make SQLite famous:

SQlite is free of expense.

SQLite is server-less.

SQLite is adaptable.

SQLite needn't bother with setup.

SQLite is cross-stage.

4) What are the upsides of utilizing SQLite? 

SQLite is extremely light weight database.

Information putting away is extremely simple and productive.

SQlite is extremely simple to learn and utilize.

5) How might you make a database in SQLite? 

In SQLite, sqlite3 direction is utilized to make database.

Language structure:

Sqlite3 database_name.db

6) How might you make a table in SQLite database? 

Make TABLE explanation is utilized to make a table in SQLite database. You need to characterize the sections and information sorts of every segment while making the table.

Language structure:

Make TABLE database_name.table_name(

column1 datatype PRIMARY KEY(one or more segments),

column2 datatype,

column3 datatype,

columnN datatype,

);



7) How might you drop a table in SQLite database? 

DROP TABLE direction is utilized to erase or for all time drop a table from SQLite database.

Language structure:

DROP TABLE table_name;

8) How might you make an AUTOINCREMENT field? 

For autoincrement, you need to proclaim a segment of the table to be INTEGER PRIMARY KEY, at that point at whatever point you embed a NULL into that segment of the table, the NULL is naturally changed over into a number which is one more noteworthy than the biggest estimation of that section over every single other line in the table, or 1 if the table is unfilled.

9) What information types are bolstered by SQLite? 

SQLite utilizes dynamic composing. Substance can be put away as INTEGER, REAL, TEXT, BLOB, or as NULL.

10) How to embed information in a table in SQLite? 

Addition INTO proclamation is utilized to embed information in a table in SQLite database. There are two different ways to embed information in table:

Method1:

Grammar:

Addition INTO TABLE_NAME [(column1, column2, column3,...columnN)]

Qualities (value1, value2, value3,...valueN);

Method2:

Linguistic structure:

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

11) How might you recover information from SQlite table? 

The SELECT order is utilized to recover information from SQLite table. On the off chance that you need to recover all segments from the table utilize SELECT * generally utilize the particular segment's name isolated by commas.

Punctuation:

SELECT * FROM table_name;

Or on the other hand

SELECT column1, column2, columnN FROM table_name;

12) What is the utilization of UPADTE inquiry in SQLIte? 

The UPDATE inquiry is utilized to change the current records in the SQLite table. You need to utilize the WHERE condition to change a particular column generally all lines will be refreshed.

Punctuation:

UPDATE table_name

SET column1 = value1, column2 = value2...., columnN = valueN

WHERE [condition];

13) How would you be able to erase the current records from a table in SQLite? 

In SQLite, DELETE order is utilized to erase the current records from a table. You should utilize the WHERE condition to pick the particular line generally all columns will be erased.

Linguistic structure:

Erase FROM table_name

WHERE [conditions....................];

14) What is the utilization of WHERE condition in CRUD proclamations? 

WHERE condition is utilized to allude a particular line where the CRUD activity is executed. Without utilizing WHERE statement every one of the lines will be influenced.

15) What is the use of and OR administrators with WHERE proviso? 

What's more, and OR administrators are utilized with WHERE proviso to join at least two than two conditions together.

Linguistic structure:

SELECT column1, column2, columnN

FROM table_name

WHERE [condition1] AND [condition2]...OR [conditionN];


16) What is the use of LIKE administrator with WHERE proviso? 

The LIKE administrator is utilized to coordinate content qualities against an example utilizing trump cards. It utilizes two trump cards % and _ with string for coordinating with info.

Language structure:

SELECT FROM table_name

WHERE segment LIKE 'XXXX%'

SELECT FROM table_name

WHERE segment LIKE 'XXXX_'

17) What is the utilization of LIMIT proviso with SELECT question? 

Utmost provision is utilized with SELECT explanation when we need a predetermined number of brought records.

Language structure:

SELECT column1, column2, columnN

FROM table_name

Utmost [no of rows]

18) Why is ORDER BY proviso utilized with SELECT explanation? 

The ORDER BY proviso is utilized to sort the got information in a particular request either climbing or plummeting.

Sentence structure:

SELECT section list

FROM table_name

[WHERE condition]

[ORDER BY column1, column2, .. columnN] [ASC | DESC];

19) What is the utilization of SQLite GROUP BY proviso? 

SQLite GROUP BY proviso is utilized to gather similar components into a gathering. It is utilized with SELECT explanation.

Language structure:

SELECT segment list

FROM table_name

WHERE [ conditions ]

Gathering BY column1, column2....columnN

Request BY column1, column2....columnN

Note: you can utilize GROUP BY and ORDER BY conditions together.

20) What is the utilization of DISTINCT condition in SQLite? 

The DISTINCT condition is constantly utilized with SELECT explanation. It is utilized to recover just one of a kind records and limit the copy sections.

It is utilized when the table has various copy records.

Linguistic structure:

SELECT DISTINCT column1, column2,.....columnN

FROM table_name

WHERE [condition]

21) What is UNION administrator? How can it work? 

SQLite UNION Operator is utilized to consolidate the outcome set of at least two tables utilizing SELECT explanation. Both the tables must have same number of fields in result table.

Grammar:

SELECT expression1, expression2, ... expression_n

FROM tables

[WHERE conditions]

Association

SELECT expression1, expression2, ... expression_n

FROM tables

[WHERE conditions];

22) What is UNION ALL administrator? What is the contrast among UNION and UNION ALL administrator? 

The UNION ALL administrator is utilized to join the aftereffect of at least two tables utilizing SELECT articulation. The one of a kind distinction among UNION and UNION ALL administrator is that UNION administrator disregards the copy sections while consolidating the outcomes while UNION ALL doesn't overlook copy esteems.

Language structure:

SELECT expression1, expression2, ... expression_n

FROM tables

[WHERE conditions]

Association ALL

SELECT expression1, expression2, ... expression_n

FROM tables

[WHERE conditions];

23) What is SQLite JOIN? What number of sorts of JOINS are bolstered in SQLite? 

SQLite JOIN proviso is utilized to consolidate at least two tables in a database. It consolidates the table by utilizing the regular estimations of the both table.

There are for the most part three sorts of JOINS bolstered in SQlite:

SQLite INNER JOIN

SQLite OUTER JOIN

SQLite CROSS JOIN

24) What is SQLite INNER JOIN? 

SQLite INNER JOIN is least complex and most regular join. It joins all lines from the two tables where the condition is fulfilled.

Language structure:

SELECT ... FROM table1 [INNER] JOIN table2 ON conditional_expression ...

25) What is SQLite OUTER JOIN? 

There are three sorts of OUTER JOINS:

Left external join

Right external join

Full external join

However, SQLite just backings left external join. The SQLite left external join restores all columns from left table and just those lines from the correct table where the join condition is fulfilled.

Linguistic structure:

SELECT ... FROM table1 LEFT OUTER JOIN table2 ON conditional_expression

26) Explain SQLite CROSS JOIN. 

The SQLite Cross join is utilized to coordinate each column of the main table with each line of the second table. On the off chance that the principal table contains x segments and second table contains y segments then the resultant Cross join table will contain the x*y sections.

Linguistic structure:

SELECT ... FROM table1 CROSS JOIN table2

27) What is SQLite date and time () work? 

SQLite date and time () capacities are utilized to recover current date and time and furthermore do estimations on the dates and time.

There are basically 6 sorts of date and time () work in SQLite:

SQLite date() Function

SQLite datetime() Function

SQLite julianday() Function

SQLite now() Function

SQLite strftime() Function

SQLite time() Function

28) What is the utilization of date() work in SQLite? 

The SQLite date() work is utilized to get the date and show it in 'YYYY-MM-DD' group.

Grammar:

date(timestring, [ modifier1, modifier2, ... modifier_n ] )

29) What is the utilization of datetime() work in SQLite? 

The SQLite datetime() work is utilized to recover current date and time in 'YYYY-MM-DD HH:MM:SS' design.

Grammar:

datetime(timestring, [ modifier1, modifier2, ... modifier_n ] )

30) What is SQLite julianday() work? 

A Julian Day is the quantity of days since Nov 24, 4714 BC 12:00pm Greenwich time in the Gregorian schedule. In this way, the julianday() work is utilized to return number of days since Nov 24, 4714 BC 12:00pm.

Linguistic structure:

julianday(timestring [, modifier1, modifier2, ... modifier_n ] )

31) What is the utilization of SQLite now() work? 

SQLite now isn't a capacity. Rather than this, it is a timestring parameter which is utilized to bring current date and time.

Language structure:

date('now')

or then again

time('now')

32) What is the use of SQLite strftime() work? 

SQLite strftime() work is utilized to bring date and time and furthermore perform time and date computation.

Linguistic structure:

strftime(format, timestring [, modifier1, modifier2, ... modifier_n ] )

33) What is the utilization of SQLite time() work? 

SQLite time() work is utilized to bring current time in 'HH-MM-SS' position.

Grammar:

time(timestring, [ modifier1, modifier2, ... modifier_n ] )

34) What do you comprehend by SQLite total capacities? 

SQLite total capacities are the kind of capacities where estimations of numerous columns are assembled as contribution on specific criteria and structure a solitary incentive as yield.

There are numerous kinds of total capacities in SQLite.

35) What is SQLite MIN total capacity? 

SQLite MIN total capacity is utilized to recover the base estimation of the articulation.

Language structure:

SELECT MIN(aggregate_expression)

FROM tables

[WHERE conditions];

36) What is SQLite MAX total capacity? 

SQLite MAX total capacity is utilized to get the greatest estimation of an articulation.

Grammar:

SELECT MAX(aggregate_expression)

FROM tables

[WHERE conditions];

37) What is SQLite AVG total capacity? 

The SQLite AVG work restores the normal estimation of the articulation.

Language structure:

SELECT AVG(aggregate_expression)

FROM tables

[WHERE conditions];

38) What is SQLite COUNT total capacity? 

The SQLite COUNT work is utilized to recover complete check of an articulation.

Sentence structure:

SELECT COUNT(aggregate_expression)

FROM tables

[WHERE conditions];

39) What is SQLite SUM total capacity? 

The SQLite SUM total capacity is utilized to get the all out summed estimation of an articulation.

Punctuation:

SELECT SUM(aggregate_expression)

FROM tables

[WHERE conditions];

40) What is the contrast among SQL and SQLite? 

The primary contrasts among SQL and SQLite are:

SQL is Structured Query Language while SQlite is a social database the executives framework for the most part utilized in android cell phones to store information.

SQL support put away strategies while SQLite does not bolster put away systems.

SQL is server based while SQLite is document based.

41) What is SQLite Transactions? 

Exchange determines a unit of work that is performed against a database. The transaction?s properties are controlled by ACID:

Atomicity: Atomicity is a property which determines that all work units are effectively finished.

Consistency: It is utilized to guarantee that the database changes states upon an effectively dedicated exchange.

Segregation: It encourages you to work exchange autonomously of and straightforward to one another.

Strength: It guarantees that the outcome or impact of a submitted exchange continues if there should arise an occurrence of a framework disappointment.

42) In which regions, SQLite is favored most? 

SQLite is wanted to work with:

Inserted gadgets.

Application document position.

Information Analysis.

Sites.

Document files.

Reserve for big business information.

Server side database.

Inner or transitory databases.

Trade for specially appointed plate records.

Exploratory SQL language expansions.

43) What is the utilization of .dump direction in SQLite? 

The .landfill direction is utilized to make a SQLite database dump. When you utilize the landfill direction every one of your information will be dumped always and can't be recovered.