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Small, practical examples. Search by task or narrow things down below.
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
Convert text without raising a conversion error
Return NULL when a numeric conversion fails.
TRY_CONVERT✓ Tested
Convert Unix time to a timestamp
Interpret a seconds-since-epoch value as UTC.
unixepoch✓ Tested
Copy selected rows into another table
SQL: INSERT SELECT performs a set-based copy with an explicit destination column list.
SQL✓ Tested
Copy selected rows into another table
SQL Server: INSERT SELECT performs a set-based copy with an explicit destination column list.
SQL Server✓ Tested
Copy selected rows into another table
Postgres: INSERT SELECT performs a set-based copy with an explicit destination column list.
Postgres✓ Tested
Copy selected rows into another table
SQLite: INSERT SELECT performs a set-based copy with an explicit destination column list.
SQLite✓ Tested
Count day boundaries between dates
Compare date values with DATEDIFF.
DATEDIFF✓ Tested
Count distinct values within a result
SQL: COUNT DISTINCT counts distinct non-null values.
SQL✓ Tested
Count distinct values within a result
SQL Server: COUNT DISTINCT counts distinct non-null values.
SQL Server✓ Tested
Count distinct values within a result
Postgres: COUNT DISTINCT counts distinct non-null values.
Postgres✓ Tested