Results for “Schema design & transactions”
Small, practical examples. Search by task or narrow things down below.
Return zero for a sum over no rows
SQL: SUM produces NULL for an empty input; COALESCE supplies the desired reporting default.
SQL✓ Tested
Return zero for a sum over no rows
SQL Server: SUM produces NULL for an empty input; COALESCE supplies the desired reporting default.
SQL Server✓ Tested
Return zero for a sum over no rows
Postgres: SUM produces NULL for an empty input; COALESCE supplies the desired reporting default.
Postgres✓ Tested
Return zero for a sum over no rows
SQLite: SUM produces NULL for an empty input; COALESCE supplies the desired reporting default.
SQLite✓ Tested
Roll back a trial update
Group a change in a transaction and undo it.
transaction✓ Tested
Round a timestamp down to its month
Group dates by a calendar boundary.
date_trunc✓ Tested
Run a first SELECT query
Postgres: Return a literal value without creating a table.
Postgres✓ Tested
Scale text within limits
Use CSS clamp to bound responsive font sizing.
CSS✓ Tested
Scroll wide code locally
Keep long code inside a horizontally scrollable CSS container.
CSS✓ Tested
Search for a literal LIKE wildcard
SQL: Declare an escape character so a percent sign in the pattern is literal.
SQL✓ Tested
Search for a literal LIKE wildcard
SQL Server: Declare an escape character so a percent sign in the pattern is literal.
SQL Server✓ Tested
Search for a literal LIKE wildcard
Postgres: Declare an escape character so a percent sign in the pattern is literal.
Postgres✓ Tested