Αποτελέσματα Αναζήτησης
9 Ιουν 2011 · delete from table where columnA in ( select columnA from ( select columnA from YourTable group by columnA having count(*) > 1 ) t )
14 Νοε 2016 · The simplest way to get the same result (almost) is to use the RANK() analytic function instead, which ranks the values based on the partition and order you supply, while allowing for ties: SELECT employee_id, last_name, salary, department_id, RANK() OVER (PARTITION BY department_id ORDER BY salary) AS rnk.
The GROUP BY clause allows you to apply aggregate functions to a subset of rows. For example, you may want to calculate the total sales by fiscal years: SELECT . fiscal_year, . SUM (sale) FROM . sales. GROUP BY . fiscal_year; Code language: SQL (Structured Query Language) (sql)
16 Απρ 2024 · Remove the user by executing the following DROP USER command: DROP USER '[username]'@'[host]'; Replace [username] and [host] with the relevant information about the user you want to delete.
If the query does not use GROUP BY (which usually imposes its own ordering regardless) and you prefer a particular key ordering, you can invoke JSON_OBJECTAGG() as a window function by including an OVER clause with an ORDER BY specification to impose a particular order on frame rows.
A window function performs an aggregate-like operation on a set of query rows. However, whereas an aggregate operation groups query rows into a single result row, a window function produces a result for each query row: The row for which function evaluation occurs is called the current row.
The GROUP BY statement is often used with aggregate functions (COUNT(), MAX(), MIN(), SUM(), AVG()) to group the result-set by one or more columns. GROUP BY Syntax SELECT column_name(s)
