database – Page 8 – CodeRavo

Removing Duplicate Rows in SQL

Removing Duplicate Rows in SQL Duplicate data can creep into any database over time, impacting data … Removing Duplicate Rows in SQLRead more

data integrity, database, delete, duplicate-rows, group by, performance, query, remove duplicates, row-number, SQL, transactions, window function

Generating Unique Identifiers in Oracle Databases

Oracle databases, prior to version 12c, didn’t offer a direct equivalent to the AUTO_INCREMENT feature found … Generating Unique Identifiers in Oracle DatabasesRead more

auto-increment, database, database-design, identity, oracle, primary-key, sequence, SQL, trigger, unique-identifier

Installing psycopg2: Resolving the pg_config Issue

Introduction psycopg2 is a popular PostgreSQL adapter for Python, allowing your Python applications to interact with … Installing psycopg2: Resolving the pg_config IssueRead more

database, error, installation, libpq-dev, pg-config, pip, PostgreSQL, psycopg2, Python, setup

Understanding and Resolving Oracle's ORA-00054 Error

Understanding and Resolving Oracle’s ORA-00054 Error The ORA-00054: resource busy and acquire with NOWAIT specified or … Understanding and Resolving Oracle's ORA-00054 ErrorRead more

database, database administration, deadlock, locking, ora-00054, oracle, performance-tuning, SQL, transactions

Retrieving the Last Record from a Database Table using SQL

In this tutorial, we will explore how to retrieve the last record from a database table … Retrieving the Last Record from a Database Table using SQLRead more

database, fetch-first-clause, last-record, limit-clause, max, SQL, subquery, top-clause

Combining Results with UNION and UNION ALL

Combining Results with UNION and UNION ALL In SQL, you often need to combine the results … Combining Results with UNION and UNION ALLRead more

combine-results, data types, database, duplicate-removal, performance, query, SELECT statement, SQL, union, union-all

Modifying Column Nullability in SQL Server

Understanding Column Nullability In relational databases, a column’s nullability defines whether the column can store a … Modifying Column Nullability in SQL ServerRead more

alter table, data integrity, database, default-constraint, not null, null values, schema-modification, SQL Server, update-statement

Understanding Character Data Types: VARCHAR vs. NVARCHAR

Understanding Character Data Types: VARCHAR vs. NVARCHAR When designing a database schema, choosing the correct data … Understanding Character Data Types: VARCHAR vs. NVARCHARRead more

character-encoding, character-sets, data types, database, nvarchar, SQL Server, Unicode, utf-16, UTF-8, varchar

Selecting Specific Columns in SQL

Selecting Specific Columns in SQL SQL (Structured Query Language) is the standard language for interacting with … Selecting Specific Columns in SQLRead more

bigquery, column-selection, data-retrieval, database, databricks, dynamic-sql, performance optimization, SELECT statement, snowflake, SQL, SQL Server

Dropping Tables Conditionally

In database management, it’s common to need to drop a table only if it exists. This … Dropping Tables ConditionallyRead more

conditional, database, drop, ibm-db2, MySQL, oracle, PostgreSQL, SQL, SQL Server, table