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# ![$lookup Graphic](https://lunarcrush.com/gi/w:26/t:$lookup.png) $lookup

$lookup sees increased engagement with MongoDB tutorials, but overall social activity is mixed. Recent posts highlight MongoDB aggregation pipelines and the $lookup operator.

### About $lookup
A cryptocurrency project.  

### Insights [#](/topic/$lookup/insights)
- $lookup engagements is up XXXXXX% from the previous week.

### Engagements: XX [#](/topic/$lookup/interactions)
---
![Engagements Line Chart](https://lunarcrush.com/gi/w:600/t:$lookup/c:line/m:interactions/iv:1d.svg)  
[Engagements 24-Hour Time-Series Raw Data](/topic/$lookup/time-series/interactions.tsv)  
**Current Value**: XX  
**Daily Average**: XX  
**1 Week**: XXX +120%  
**1 Month**: XXX +10%  
**1-Year High**: XXX on 2025-06-17  
**1-Year Low**: X on 2025-05-09  

| Social Network | X | YouTube |
| -------------- | - | ------- |
| Engagements    | X | XX      |
  

  
  
### Mentions: X [#](/topic/$lookup/posts_active)
---
![Mentions Line Chart](https://lunarcrush.com/gi/w:600/t:$lookup/c:line/m:posts_active/iv:1d.svg)  
[Mentions 24-Hour Time-Series Raw Data](/topic/$lookup/time-series/posts_active.tsv)  
**Current Value**: X  
**Daily Average**: X  
**1 Month**: X no change  
**1-Year High**: XX on 2025-08-03  
**1-Year Low**: X on 2025-04-30  

| Social Network | X | YouTube |
| -------------- | - | ------- |
| Mentions       | X | X       |
  

  
  
### Creators: X [#](/topic/$lookup/contributors_active)
---
![Creators Line Chart](https://lunarcrush.com/gi/w:600/t:$lookup/c:line/m:contributors_active/iv:1d.svg)  
[Creators 24-Hour Time-Series Raw Data](/topic/$lookup/time-series/contributors_active.tsv)  
X unique social accounts have posts mentioning $lookup in the last XX hours which is no change from in the previous XX hours
**Daily Average**: X  
**1 Month**: X no change  
**1-Year High**: XX on 2025-08-03  
**1-Year Low**: X on 2025-04-30  

The most influential creators that mention $lookup in the last XX hours

| Creator                                      | Rank | Followers | Posts | Engagements |
| -------                                      | ---- | --------- | ----- | ----------- |
| [@vishal_jati](/creator/twitter/vishal_jati) | X    | XX        | X     | X           |

[View More](/list/creators/$lookup/100)

**Top topics mentioned**
In the posts about $lookup in the last XX hours

[$match](/topic/$match), [$project](/topic/$project), [$addfields](/topic/$addfields), [discord](/topic/discord), [discord server](/topic/discord-server), [baba](/topic/baba), [filter](/topic/filter), [$group](/topic/$group), [$sort](/topic/$sort), [$cond](/topic/$cond)

### Top Social Posts [#](/topic/$lookup/posts)
---
Top posts by engagements in the last XX hours

*Showing only X posts for non-authenticated requests. Use your API key in requests for full results.*

"In MongoDB it's done with $lookup which lets you pull off a left outer join-like operation across two or more collections"  
[X Link](https://x.com/RajRishab_/status/1979229515437215929) [@RajRishab_](/creator/x/RajRishab_) 2025-10-17T16:54Z XX followers, X engagements


"MongoDB Aggregation Pipelines : $match filter documents (like SQL WHERE) $lookup join collections (like JOIN) $project reshape fields hide sensitive data $addFields create new computed fields $cond conditional logic (if/else in queries) @Hiteshdotcom #MongoDB"  
[X Link](https://x.com/vishal_jati/status/1975265849700209092) [@vishal_jati](/creator/x/vishal_jati) 2025-10-06T18:24Z XX followers, XX engagements


"📚 Todays learning journey: ✅ Understood the Subscription Schema ✅ Explored MongoDB Aggregation Pipelines ✅ Learned sub-pipelines & routes 🔍 $lookup $match $project $addFields Big thanks to @Hiteshdotcom sir #MERN #Backend #MongoDB #LearningInPublic"  
[X Link](https://x.com/vishal_jati/status/1975261335022678147) [@vishal_jati](/creator/x/vishal_jati) 2025-10-06T18:06Z XX followers, XX engagements


"$match Filter documents. $project Choose which fields to show/hide or add computed fields. $group Group documents. $sort Sort documents. $limit / $skip Paginate results. $lookup Join with another collection"  
[X Link](https://x.com/BhavayNagpal1/status/1972988213154504898) [@BhavayNagpal1](/creator/x/BhavayNagpal1) 2025-09-30T11:33Z XXX followers, XX engagements