Examples of using Subquery in English and their translations into Spanish
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Colloquial
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Official
Is a subquery that returns one value.
MERGE works well with a table or a subquery.
Message: Subquery returns more than 1 row.
Could not allocate ancillary table for a subquery.
Arguments subquery Is a restricted SELECT statement.
NOT EXISTS' Row must match a value in the subquery.
Returns TRUE if a subquery contains any rows. Examples.
Good evening, Just a hint regarding the subquery.
Subquery optimization for IN is not as effective as for=.
This topic refers to ALL when it is used with a subquery.
The options are subquery and the new join(which is the default).
However, the BETWEEN can be used within the subquery.
Using NULL in a subquery to still return a result set.
The big question now is, is it really better than the subquery method?
The subquery can be used in conjunction with the UPDATE statement.
Currently, you cannot update a table andselect from the same table in a subquery.
Also, you cannot use a subquery to select from the table that is being loaded.
Use the EXISTS predicate to efficiently check for the existence of rows in a subquery.
The subquery must return only a scalar value(that is, a single value per row).
The INSERT statement uses the data returned from the subquery to insert into another table.
In other words, for a subquery that returns rows of n-tuples, this is supported.
If you only want to copy a subset of the data,you can use a WHERE clause in the subquery.
Each subquery must have a table name that can be referenced in the FROM clause.
The number of column names must be equal to orless than the number of columns defined by subquery.
Each subquery defines a temporary table, similar to a view definition, which you can reference in the FROM clause.
Indicates the input to the query, where from_item can be a view,a join construct, or a subquery as described below.
Topics on this workshop, which I have titled" Query Optimization with MySQL 5.7 and MariaDB 10: Even Newer Tricks", will include: new 5.7 cost-based optimizer, virtual columns, query rewriter plugin api,new join methods, subquery optimization, sql mode changes, full text search and GIS improvements.
IN subqueries that are table subqueries are not supported; for example.
Subqueries can't be used in the outer query's HAVING clause.
Updatable views with subqueries anywhere other than in the WHERE clause.