Append is used to merge the results of subqueries, which is usually used in the Union All operation. Exchange Exchange is used to exchange data among shards. You do not need to pay much attention to this operator. Forward Forward is used to transmit data of operators between HQE and PQE...
|1| PRIMARY |staff| ALL |NULL| NULL |NULL| NULL |2| NULL || 2 |UNION| staff |ALL| NULL |NULL| NULL |NULL| 2 |NULL| |NULL| UNION RESULT |<union1,2>| ALL |NULL| NULL |NULL| NULL |NULL| Using temporary |+---+---+---+---+---+---+---+---+---+---+3rowsins...
DFEOptionalJoin – Performs the optional join A OPTIONAL B ≡ (A JOIN B) UNION (A MINUS_NE B). This is a blocking operation. DFEOverlapSimilarityAlgo – Explain operator for invocations of the Overlap Similarity algorithm, which measures the overlap between the neighbors of two nodes. ...
What is Deepseek Explain Training Algorithm - Have you heard about the sputnik moment in AI? 20 January 2025. This date. Yes, this date is what some people in the AI industry believe as the sputnik moment. Sputnik, as you might know, was the first artif
DEPENDENT UNION The UNION is DEPENDENT. DERIVED The SELECT is DERIVED from the PRIMARY. MATERIALIZED The SUBQUERY is MATERIALIZED. Materialized tables will be populated at first access and will be accessed by the primary key (= one key lookup). Number of rows in EXPLAIN shows the cost of popu...
For more information about these algorithms, see Block Nested-Loop Join Algorithm, and Batched Key Access Joins. Using MRR (JSON property: message) Tables are read using the Multi-Range Read optimization strategy. See Section 8.2.1.10, “Multi-Range Read Optimization”. Using sort_union(....
See Batched Key Access Joins, for information about the Batched Key Access algorithm. Using MRR (JSON property: message) Tables are read using the Multi-Range Read optimization strategy. See Section 10.2.1.11, “Multi-Range Read Optimization”. Using sort_union(...), Using union(...)...
Allows a large table to be broken up into a number of smaller partitions which can be queried much more quickly than the table as a whole a union all view is built over the top to provide the original functionality Check constraints or where clauses provide partition elimination capabilities ...
In Europe, for example, the European Union has strict restrictions on how data can be moved in bulk from one country to another or shared by companies like Google that have multiple subsidiaries operating across countries and continents. While Internet-based cloud computing makes national boundaries...
We have a simple query to the ‘rental’ table which should return some information about rentals that happened at a given point in time. ‘select_type’ is SIMPLE which means this is not a UNION nor subquery. Next bit of the information is the table which is queried –‘rental’ table...