Results for “exec”
Small, practical examples. Search by task or narrow things down below.
Read named columns from a table
SQL: Choose the columns needed and request a deterministic row order.
SQL✓ Tested
Read the last value of the complete partition
SQL: Specify an unbounded-following frame so LAST_VALUE does not stop at the current row.
SQL✓ Tested
Read the next row’s value
SQL: LEAD reads a later ordered row without a self join and supports a fallback at the end.
SQL✓ Tested
Read the smallest and largest values
SQL: Use MIN and MAX without sorting and fetching every row.
SQL✓ Tested
Read updated base-table values through a view
SQL: An ordinary view reflects later changes to its underlying data.
SQL✓ Tested
Reference a parent identified by two columns
SQL: A composite foreign key checks the complete referenced key rather than either column independently.
SQL✓ Tested
Reject a negative quantity with CHECK
SQL: Combine NOT NULL and CHECK because an unknown NULL check result is normally accepted.
SQL✓ Tested
Reject duplicate business identifiers
SQL: A UNIQUE constraint protects a business key independently of the primary key.
SQL✓ Tested
Remove dependent rows with a declared cascade
SQL: ON DELETE CASCADE removes children when their referenced parent is deleted.
SQL✓ Tested
Remove duplicate result values
SQL: Use DISTINCT when repeated category values are not useful.
SQL✓ Tested
Remove duplicate values while keeping the smallest key
SQL: Identify retained keys in a grouped subquery before deleting other copies.
SQL✓ Tested
Remove surrounding spaces from text
SQL: TRIM removes leading and trailing space characters by default.
SQL✓ Tested