Results for “exec”
Small, practical examples. Search by task or narrow things down below.
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 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
Copy selected rows into another table
SQL: INSERT SELECT performs a set-based copy with an explicit destination column list.
SQL✓ Tested
Count distinct values within a result
SQL: COUNT DISTINCT counts distinct non-null values.
SQL✓ Tested
Count rows per category
Aggregate rows sharing the same category.
GROUP BY✓ Tested
Count rows satisfying separate conditions
SQL: SUM over CASE expressions calculates several conditional counts in one scan.
SQL✓ Tested