SQL WHERE Clause Explained: Syntax, Operators, and Examples
Learn how SQL WHERE conditions filter rows, combine multiple predicates, handle NULL values, and work safely with SELECT, UPDATE, and DELETE statements.
September 17, 2026 · 9 min read
Mobin Yazdanparast
SQL SELECT Statement: Syntax, Examples, and Best Practices
Learn how to use SQL SELECT to retrieve, filter, sort, group, and join relational data, with practical examples and database-specific notes.
September 14, 2026 · 8 min read
Mobin Yazdanparast
MySQL Architecture Explained: Layers, InnoDB & Query Flow
Understand how MySQL handles connections, parses and optimizes SQL, delegates work to storage engines, and uses InnoDB memory and disk structures to manage data.
September 13, 2026 · 14 min read
Mobin Yazdanparast
What We Learned Building DBO Studio 1.1.0
DBO Studio 1.1.0 is about removing uncertainty: schema diagrams for unfamiliar databases, Safe Mode for the wrong connection, typed editors for real column types, and pagination so a SELECT without LIMIT no longer means fetch everything.
September 3, 2026 · 8 min read
Mobin Yazdanparast
PostgreSQL Unique Index vs Unique Constraint: Which to Use?
Every PostgreSQL unique constraint is enforced by a unique index, but not every unique index backs a constraint. Learn the real differences, the SQL for each, and when to use which.
September 1, 2026 · 8 min read
Mobin Yazdanparast
PostgreSQL Expression Indexes Explained (With Examples)
A practical guide to the PostgreSQL expression index: syntax, the IMMUTABLE requirement, exact planner matching, JSONB and date_trunc examples, and the write-amplification trade-off.
August 31, 2026 · 9 min read
Mobin Yazdanparast
PostgreSQL Partial Indexes Explained (With Examples)
Learn how PostgreSQL partial indexes use a WHERE clause on CREATE INDEX to shrink index size, cut write overhead, and speed up queries that target a hot subset of rows.
August 30, 2026 · 9 min read
Mobin Yazdanparast
PostgreSQL Composite Indexes Best Practices
Master PostgreSQL composite indexes best practices: column order, leftmost prefix rule, INCLUDE, and when to prefer multicolumn over separate indexes for faster queries.
August 21, 2026 · 7 min read
Mobin Yazdanparast
PostgreSQL BRIN Index Explained: A Complete Guide
A deep dive into PostgreSQL BRIN indexes: how they work, when to use them over B-tree, and how to configure them for large table optimization with minimal storage overhead.
August 20, 2026 · 9 min read
Mobin Yazdanparast
PostgreSQL GiST Index: When and Why to Use It
A practical guide to PostgreSQL GiST indexes: how they work, when they beat B-tree and GIN, and how to create and verify them with real, runnable examples.
August 19, 2026 · 5 min read
Mobin Yazdanparast