Results for “Schema design & transactions”
Small, practical examples. Search by task or narrow things down below.
Combine text values with a separator
Postgres: Use the concatenation operator supported by the selected SQL dialect.
Postgres✓ Tested
Combine text values with a separator
SQLite: Use the concatenation operator supported by the selected SQL dialect.
SQLite✓ 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 its own group average
SQL Server: A correlated aggregate computes a different comparison value for each group.
SQL Server✓ Tested
Compare a row with its own group average
Postgres: A correlated aggregate computes a different comparison value for each group.
Postgres✓ Tested
Compare a row with its own group average
SQLite: A correlated aggregate computes a different comparison value for each group.
SQLite✓ Tested
Compare a row with the previous row
Read a preceding value with LAG.
LAG✓ Tested
Compute an integer weighted average
SQL: Multiply before summing and guard a zero total weight with NULLIF.
SQL✓ Tested
Compute an integer weighted average
SQL Server: Multiply before summing and guard a zero total weight with NULLIF.
SQL Server✓ Tested
Compute an integer weighted average
Postgres: Multiply before summing and guard a zero total weight with NULLIF.
Postgres✓ Tested
Compute an integer weighted average
SQLite: Multiply before summing and guard a zero total weight with NULLIF.
SQLite✓ Tested
Copy selected rows into another table
SQL: INSERT SELECT performs a set-based copy with an explicit destination column list.
SQL✓ Tested