How to speed up join stack overflow in SQL Server?
Put indexes on attributeId. Or, make sure indexes exist where attributeId is the first column in the key (SQL Server can still use indexes if it’s not the 1st column, but it’s not as fast). Highlight the query in Query Analyzer and hit ^L to see the plan.
When to use update join in SQL Server?
SQL Server UPDATE JOINsyntax. To query data from related tables, you often use the joinclauses, either inner joinor left join. In SQL Server, you can use these join clauses in the UPDATEstatement to perform a cross-table update. The following illustrates the syntax of the UPDATE JOINclause:
How do you update joinsyntax in SQL Server?
SQL Server UPDATE JOINsyntax. To query data from related tables, you often use the joinclauses, either inner joinor left join. In SQL Server, you can use these join clauses in the UPDATEstatement to perform a cross-table update.
How to speed up the speed of this query?
This query takes more than 5mins when the date range is set to 1 year. I don’t know if it’s possible but I am afraid that the user might extend the date range to like ten years and crash it. Anyone know how I can speed this up?
Can a table be joined with itself in BigQuery?
In a self join, a table is joined with itself. This is typically a SQL anti-pattern which can be an expensive operation for large tables and might require to get data in more than one pass. Instead, it is recommended to avoid self joins and instead use analytic (window) functions to reduce the bytes generated by the query.
How does a broadcast join work in BigQuery?
When joining a large table to a small table, BigQuery creates a broadcast join where the small table is sent to each slot processing the large table. Even though the SQL query optimizer can determine which table should be on which side of the join, it is recommended to order joined tables appropriately.