* NB: will not work on utility statements */voidExplainPrintPlan(ExplainState *es, QueryDesc *queryDesc){ Bitmapset *rels_used = NULL; PlanState *ps; /* Set up ExplainState fields associated with this plan tree */ Assert(queryDesc->plannedstmt != NULL); es->pstmt = queryDesc->plann...
The DESCRIBE statement is provided for compatibility with Oracle. The SHOW CREATE TABLE, SHOW TABLE STATUS, and SHOW INDEX statements also provide information about tables. See Section 15.7.7, “SHOW Statements”. The explain_format system variable has no effect on the output of EXPLAIN when ...
Sequential ScanscanAmazon Redshift relation scan or table scan operator or step. Scans whole table sequentially from beginning to end; also evaluates query constraints for every row (Filter) if specified with WHERE clause. Also used to run INSERT, UPDATE, and DELETE statements. ...
It can be an aggregate function or a combination of multiple aggregate functions. In SQL statements, aggregate operators are classified into the following types: GroupAggregate: Data has been pre-sorted based on the GROUP BY clause. HashAggregate: Data is hash-calculated, distributed to ...
It makes these decisions based on the statistical information it has about your data and by leveraging Oracle database features such as hash joins, parallel query, partitioning, etc. Still it is expected that the optimizer will generate sub-optimal plans for some SQL statements now and then. ...
The DESCRIBE statement is provided for compatibility with Oracle. The SHOW CREATE TABLE, SHOW TABLE STATUS, and SHOW INDEX statements also provide information about tables. See Section 15.7.7, “SHOW Statements”. The explain_format system variable, added in MySQL 8.0.32, has no effect on ...
A Stack has two main operations: Push: Pushes an element into the stack Pop: Returns the last element that was put into the stack The Stack's functionality is described as "First in - last out", the first element that enters t...
(Frankly, a loop is about 20 times easier than tail recursion in about 90% of the cases; same for passing functions around). However, those things are rewarding to play with in and of themselves (and who care about the long run anyway? In the long term, we are all dead). At least...
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... ; continuing after loop The 'break' and 'continue' expressions also work with the 'while' and 'repeat...until' loops. Return Values A function returns the value and type of the last expression evaluated. Functions will always have a return value, although it may not be meaningful. ...