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Core SQL
CREATE TABLE INSERT SELECT WHERE ORDER BY LIMIT UPDATE DELETE DISTINCT Aliases
Expressions & Filters
AND OR NOT IN BETWEEN LIKE GLOB IS NULL CASE expression COALESCE NULLIF CAST
Joins & Grouping
INNER JOIN LEFT JOIN CROSS JOIN Self join GROUP BY HAVING COUNT SUM AVG MIN MAX GROUP_CONCAT FILTER clause
Constraints & Schema
PRIMARY KEY INTEGER PRIMARY KEY rowid UNIQUE NOT NULL CHECK FOREIGN KEY Generated columns STRICT tables WITHOUT ROWID ALTER TABLE
Indexes & Query Planner
CREATE INDEX Composite index Partial index Expression index UNIQUE index EXPLAIN QUERY PLAN ANALYZE PRAGMA optimize Covering index concept Index selectivity
Transactions & Concurrency
BEGIN transaction COMMIT ROLLBACK SAVEPOINT ROLLBACK TO Deferred transaction Immediate transaction Exclusive transaction WAL mode Busy timeout
SQLite Functions
datetime() strftime() json_extract() json_each() printf() instr() substr() replace() random() changes()
Advanced SQLite
Common table expressions Recursive CTE Window ROW_NUMBER Window LAG UPSERT ON CONFLICT RETURNING clause ATTACH DATABASE VACUUM FTS5 virtual table Triggers
SQLite Complete Course / Core SQL

WHERE

Learn WHERE in SQLite through the exact construct, a dedicated example, a boundary case, and a mastery check.

10 min read • Beginner

WHERE is an atomic SQLite lesson inside Core SQL. The example uses the specific syntax, command, API, instruction, or language rule named by this lesson.

Study the construct itself, then change one relevant input and predict the result before running it. That keeps this lesson focused on WHERE rather than on generic SQLite syntax.

Topic-specific example

sqlite-01-04.sql
sql Try It Live 
SELECT id,email FROM users WHERE active=1 AND deleted_at IS NULL;
Edge case / engineering note

Test WHERE with an empty result, NULL/missing value, duplicate key, or concurrent operation where relevant; database behavior should be verified at the boundary shown by this example.

Content source & attribution
Original Syntaxis Content · Original Syntaxis Content

Lesson quizzes

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