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For example, to annotate each post with the email address of the author of the newest comment on that post:

On PostgreSQL, the SQL looks like:

Note

The examples in this section are designed to show how to force Django to execute a subquery. In some cases it may be possible to write an equivalent queryset that performs the same task more clearly or efficiently.

New in Django 1.11.

Use OuterRef when a queryset in a Subquery needs to refer to a field from the outer query. It acts like an CuddlyIIPanda 2018 Summer 5cm Platform Design Woven Women Discount Codes Shopping Online Official Cheap Price Outlet Visa Payment MzvNOlS
expression except that the check to see if it refers to a valid field isn’t made until the outer queryset is resolved.

Instances of OuterRef may be used in conjunction with nested instances of Subquery to refer to a containing queryset that isn’t the immediate parent. For example, this queryset would need to be within a nested pair of Subquery instances to resolve correctly:

There are times when a single column must be returned from a Subquery , for instance, to use a Subquery as the target of an __in lookup. To return all comments for posts published within the last day:

In this case, the subquery must use Shop Offer Online Dailan Jeanna Sexy slippers women summer 2018 new super Cheap Sale Low Shipping Fee Discount Big Discount Orange 100% Original Perfect 58iZHayoT
to return only a single column: the primary key of the post.

To prevent a subquery from returning multiple rows, a slice ( [:1] ) of the queryset is used:

In this case, the subquery must only return a single column and a single row: the email address of the most recently created comment.

(Using get() instead of a slice would fail because the OuterRef cannot be resolved until the queryset is used within a Subquery .)

New in Django 1.11.

Exists is a Subquery subclass that uses an SQL EXISTS statement. In many cases it will perform better than a subquery since the database is able to stop evaluation of the subquery when a first matching row is found.

For example, to annotate each post with whether or not it has a comment from within the last day:

It’s unnecessary to force Exists to refer to a single column, since the columns are discarded and a boolean result is returned. Similarly, since ordering is unimportant within an SQL EXISTS subquery and would only degrade performance, it’s automatically removed.

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interest

1 mass noun The feeling of wanting to know or learn about something or someone.

in singular
attentiveness , undivided attention, absorption, engrossment, heed, regard, notice, scrutiny
attraction , appeal, fascination, charm, beauty, allure, allurement, temptation, tantalization
hobby , pastime, leisure activity, leisure pursuit, recreation, entertainment, diversion, amusement, relaxation

2 mass noun Money paid regularly at a particular rate for the use of money lent, or for delaying the repayment of a debt.

as modifier
dividends , profits, returns

3 The advantage or benefit of a person or group.

of benefit to , to the advantage of, for the sake of, for the benefit of
concern , business, business matter, matter, care

4 A stake or involvement in an undertaking, especially a financial one.

stake , share, portion, claim, investment, stock, equity
involvement , partiality, partisanship, preference, loyalty

5 usually interests A group or organization having a common concern, especially in politics or business.

interests

1 Excite the curiosity or attention of (someone)

be of interest to , appeal to, attract, be attractive to, intrigue, fascinate
arouse someone's interest in , persuade to buy, sell
interest someone in

Phrases

at interest

(of money borrowed) on the condition that interest is payable.

declare an (or one's) interest

Make known one's financial interests in an undertaking before it is discussed.

in the interests (or interest) of something

For the benefit of.

of interest

Interesting.

with interest

1 With interest charged or paid.

Origin
of trauma was not directly associated with infant disorganization, however.
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However, women at all gestations and across the range of severities displayed a wide range of scores on measures of mood.
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Most studies (n = 51, 86.4%) failed to consider potentially confounding variables in their designs such as open patient selection, of illness or non-blind measurement.
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All three categories embraced, however, various severities of disability and therefore only approximated the individual's functional health and capacity.
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There is great international variability in patient mix and of illness.
From Cambridge English Corpus
Therefore, we controlled for of illness using type and intensity of drug therapy, the number of comorbidities, glycemic level, and health service use.
From Cambridge English Corpus
Validated symptom assessment tools may assist the clinician to gain consistent insight into the patient's perception of a symptom (eg, its , etc).
From Cambridge English Corpus
The process of patient education and reassurance helps to demystify tinnitus and can facilitate a reduction in the of this symptom.
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Probably it will require more categories of patients, coupled with some form of ratings.
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Mothers with decreasing depression reported a decrease in depressive symptom from a high to a moderate level over the course of the study period.
From Cambridge English Corpus
Mothers indicated the of psychological symptoms during the foregoing month on a 5-point scale.
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Thus, these findings may not generalize to older samples or to children who differ in the or frequency of their victimization experiences.
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Hospitalization for asthma, a potentially avoidable outcome, is an important population-level marker of asthma .
From Cambridge English Corpus

Translations of “severity”

嚴重的, 嚴重, 不和善的…

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