Results for “CMD”
Small, practical examples. Search by task or narrow things down below.
Reference a parent identified by two columns
SQL Server: A composite foreign key checks the complete referenced key rather than either column independently.
SQL Server✓ Tested
Reject a negative quantity with CHECK
SQL Server: Combine NOT NULL and CHECK because an unknown NULL check result is normally accepted.
SQL Server✓ Tested
Reject duplicate business identifiers
SQL Server: A UNIQUE constraint protects a business key independently of the primary key.
SQL Server✓ Tested
Reject NaN and infinite values
PowerShell: Double.IsFinite excludes numeric values unsuitable for ordinary bounded calculations.
PowerShell✓ Tested
Remove an optional hashtable entry
PowerShell: Remove changes the map in place without changing unrelated entries.
PowerShell✓ Tested
Remove dependent rows with a declared cascade
SQL Server: ON DELETE CASCADE removes children when their referenced parent is deleted.
SQL Server✓ Tested
Remove duplicate result values
SQL Server: Use DISTINCT when repeated category values are not useful.
SQL Server✓ Tested
Remove duplicate values while keeping the smallest key
SQL Server: Identify retained keys in a grouped subquery before deleting other copies.
SQL Server✓ Tested
Remove surrounding spaces from text
SQL Server: TRIM removes leading and trailing space characters by default.
SQL Server✓ Tested
Rename a file in its current directory
PowerShell: Rename-Item changes the name without moving the item to another directory.
PowerShell✓ Tested
Repeat the first ordered value beside each row
SQL Server: FIRST_VALUE reads the first value in the current window frame.
SQL Server✓ Tested
Repeat while a condition holds
PowerShell: Repeat while a condition holds using PowerShell 7.
PowerShell✓ Tested