Results for “post”
Small, practical examples. Search by task or narrow things down below.
Calculate each group’s numeric spread
SQL: Subtract MIN from MAX to report the difference between extremes.
SQL✓ Tested
Check JSONB containment
Test whether an object contains a key-value pair.
jsonb✓ Tested
Collect ordered values into an array
Build a sorted array from query rows.
array_agg✓ Tested
Combine matching rows with INNER JOIN
Read product names with their matching stock values.
INNER JOIN✓ Tested
Combine results while retaining duplicates
SQL: UNION ALL does not spend work removing equal rows.
SQL✓ Tested
Combine results without duplicates
Merge compatible result sets with UNION.
UNION✓ Tested
Combine text values with a separator
SQL: Use the concatenation operator supported by the selected SQL dialect.
SQL✓ Tested
Commit multiple related changes together
SQL: The first transaction prepares the fixtures. The second commits both updates as one unit.
SQL✓ Tested
Compare a row with its own group average
SQL: A correlated aggregate computes a different comparison value for each group.
SQL✓ Tested
Compare a row with the previous row
Read a preceding value with LAG.
LAG✓ Tested
Compare with a calculated value
Find products above the average price.
subquery✓ Tested
Compute an integer weighted average
SQL: Multiply before summing and guard a zero total weight with NULLIF.
SQL✓ Tested