by lochan2014 | Jun 2, 2024 | SQL
Date and Time manipulation in Oracle SQL In Oracle SQL, date and time manipulation is essential for many database operations, ranging from basic date arithmetic to complex formatting and extraction. Here’s a guide covering various common operations you might... by lochan2014 | Jun 5, 2024 | SQL
Function NameDescriptionExample UsageResultCONCATConcatenates two strings.SELECT CONCAT(‘Oracle’, ‘PL/SQL’) FROM dual;OraclePL/SQL“ (Concatenation)Concatenates two strings.LENGTHReturns the length of a string.SELECT... by lochan2014 | Apr 8, 2024 | SQL
Indexing in SQL is a technique used to improve the performance of queries by creating special data structures (indexes) that allow for faster data retrieval. Indexes are created on one or more columns of a table, and they store the values of those columns in a sorted... by lochan2014 | Apr 7, 2024 | SQL
LIKE Operator: The LIKE operator is used to search for a specified pattern in a column. It allows the use of wildcards: % (percent sign): Matches zero or more characters. _ (underscore): Matches any single character. Examples: SELECT * FROM employees WHERE last_name... by lochan2014 | Nov 7, 2024 | SQL
Here’s a categorized Spark SQL function reference, which organizes common Spark SQL functions by functionality. This can help with selecting the right function based on the operation you want to perform. 1. Aggregate Functions FunctionDescriptionExampleavg()Calculates... by lochan2014 | Nov 1, 2024 | SQL
Data Definition Language (DDL) – to define and modify the structure of a database. Data Manipulation Language (DML) – to access, manipulate, and modify data in a database. Data Control Language (DCL) – to control user access to the data in the database...