Results for “SQL”
Small, practical examples. Search by task or narrow things down below.
Create an index matching filter and ordering columns
SQLite: Place the equality-filter column before the ordering column in this composite index.
SQLite✓ Tested
Delete one row from a practice table
SQL: Restrict DELETE with a primary-key condition and verify the remaining row count.
SQL✓ Tested
Delete one row from a practice table
SQL Server: Restrict DELETE with a primary-key condition and verify the remaining row count.
SQL Server✓ Tested
Delete one row from a practice table
SQLite: Restrict DELETE with a primary-key condition and verify the remaining row count.
SQLite✓ Tested
Delete rows selected by a related table
SQL: A correlated EXISTS limits the delete to explicitly listed records.
SQL✓ Tested
Delete rows selected by a related table
SQL Server: A correlated EXISTS limits the delete to explicitly listed records.
SQL Server✓ Tested
Delete rows selected by a related table
SQLite: A correlated EXISTS limits the delete to explicitly listed records.
SQLite✓ Tested
Display a fallback for missing data
SQL: Return a supplied label when a column contains NULL.
SQL✓ Tested
Display a fallback for missing data
SQL Server: Return a supplied label when a column contains NULL.
SQL Server✓ Tested
Display a fallback for missing data
SQLite: Return a supplied label when a column contains NULL.
SQLite✓ Tested
Distinguish row count from non-null value count
SQL: COUNT(*) includes every row while COUNT(column) skips NULL values.
SQL✓ Tested
Distinguish row count from non-null value count
SQL Server: COUNT(*) includes every row while COUNT(column) skips NULL values.
SQL Server✓ Tested