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SQLite Articles
Found 11 articles
How to Create a Backup of a SQLite Database Using Python?
SQLite is a popular lightweight and serverless database management system used in many applications. It is known for its ease of use, small footprint, and portability. However, just like any other database, it is important to have a backup of your SQLite database to protect against data loss. Python provides built-in support for SQLite through the sqlite3 module, making it easy to create database backups. In this tutorial, we will explore how to create a backup of a SQLite database using Python's iterdump() method. Prerequisites Before starting, ensure SQLite3 is installed on your system. You can check ...
Read MoreCan Google Analytics track interactions in an offline HTML5 app?
Google Analytics is a freemium analytic tool that provides detailed statistics of web traffic. It is used by more than 60% of website owners. Analytics tools offer insights into website performance, visitor behavior, and data flow. These tools are inexpensive and easy to use, sometimes even free. Yes, Google Analytics can track interactions in offline HTML5 apps, but with specific limitations and considerations. How Offline Tracking Works When an HTML5 application goes offline, Google Analytics stores tracking events in the browser's local storage or SQLite database. After storing these events, it waits until the user comes back ...
Read MoreDelete duplicate alphanumeric entries from column data in SQL
You can use regular expressions to remove duplicate consecutive alphanumeric characters from column data in SQL. The REPLACE_REGEXPR function with pattern matching allows you to identify and replace repeated characters with a single occurrence. Syntax The basic syntax for removing duplicate alphanumeric entries using regular expressions is − REPLACE_REGEXPR ('([A-Za-z0-9])\1+' in column_name WITH '\1' OCCURRENCE ALL) Where ([A-Za-z0-9])\1+ is the regex pattern that captures any alphanumeric character and matches one or more consecutive occurrences ...
Read MoreDifference between stored procedure and triggers in SQL
Stored Procedures Stored Procedures is a group of pre-compiled SQL statements that is stored in a database and can be reused anytime. It allows you to do many things in one command. So doing several activities in a database will be easier and quicker than before. A stored procedure can be called from SQL commands as well as applications like Python, Java, or PHP. Syntax Following is the syntax to create a stored procedure − CREATE PROCEDURE procedure_name AS BEGIN -- SQL statements END; Example Let us create a stored procedure where it ...
Read MoreDifference between hierarchical and network database model in SQL
Hierarchical Data Model In the Hierarchical data model, the relationship between the table and data is defined in parent-child structure. In this structure, data is arranged in the form of a tree structure. This model supports one-to-one and one-to-many relationships. Network Model The Network model arranges data in a graph structure. In this model, each parent can have multiple children, and children can also have multiple parents. This model supports many-to-many relationships as well. Comparison Table ...
Read MoreDifference between correlated and non-collreated subqueries in SQL
SQL query is used to fetch data from the database. In some of the scenario you may need some perquisite data to call subsequent SQL query to fetch data from a table so instead of writing two seperate query we can write SQL query within the query. Therefore subQuery is a way to combine or join them in single query. Subqurey can have two types −Correlated subquery - In correlated subquery, inner query is dependent on the outer query. Outer query needs to be executed before inner queryNon-Correlated subquery - In non-correlated query inner query does not dependent on the outer ...
Read MoreWrite a SQL query to count the number of duplicate TRANSACTION_ID in an ORDERS DB2 table
We can find the duplicate TRANSACTION_ID in the ORDERS DB2 table using the below query:ExampleSELECT TRANSACTION_ID, COUNT(*) AS TRANSACTION_COUNT FROM ORDER GROUP BY TRANSACTION_ID HAVING COUNT(*) > 1The purpose of COUNT(*) is to count the number of rows. We will group the result based on the TRANSACTION_ID using GROUP BY function and to display the duplicate transaction ids, we will place a predicate using HAVING statement for COUNT(*) greater than one.For example, consider the below TRANSACTIONS DB2 table:TRANSACTION_IDTRANSACTION_STATUSIRN22345PAIDIRN22345PAIDIRN22345PAIDIRN56902PAIDIRN99781UNPAIDIRN56902PAIDThe query will give the below result:TRANSACTION_IDTRANSACTION_COUNTIRN223453IRN569022IRN997811
Read MoreExplain SQL describing COUNT aggregate and CURRENT DATE function
Problem: Write a SQL query to count the number of orders which were placed today from the ORDERS DB2 table. (The date should not be hardcoded)SolutionWe can find the count of orders which are placed today using the below DB2 query:ExampleSELECT COUNT(ORDER_ID) AS ORDER_COUNT FROM ORDERS WHERE ORDER_DATE = CURRENT DATEIn this query, we have used the COUNT COLUMN function which will count the total number of ORDER_ID (primary key). In the WHERE clause, we will use the predicate for the ORDER_DATE column. The CURRENT DATE is a DB2 inbuilt function which will return the current system date.For example, if ...
Read MoreExample of SQL query describing the conditional processing
Problem: Write a SQL query to display 2 columns. First column should have ORDER_ID, the second column should give the value as YES/NO for free shipping based on ORDER_TOTAL > 500.SolutionThe query to display ORDER_ID and free shipping result based on the ORDER_TOTAL criteria can be written as below.ExampleSELECT ORDER_ID, CASE WHEN ORDER_TOTAL > 500 THEN ‘YES’ ELSE ‘NO’ AS FREE_SHIPPING END FROM ORDERSWe will use CASE expressions through which we can implement a logic to check the ORDER_TOTAL. If the ORDER_TOTAL is greater than 500 then we will get ‘YES’ for the free shipping ...
Read MoreOverview of Packages in Oracle
Packages are SQL procedures, functions, variables, statements etc. that are grouped into a single unit. Many different applications can share the contents of a package, as it is stored in the database.Parts of a PackageThe following are the parts of a package in Oracle −Package SpecificationThe package specifications contains information about all the procedures, functions, variables, constants etc. stored inside it. It has the declaration of all the components but not the code.All the objects that are in the specification are known as public objects. If there is any object that is not available in the specification but is coded ...
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