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Valid LookML-Developer Test Answers & LookML-Developer Exam PDF
Google LookML-Developer Exam Syllabus Topics:
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NEW QUESTION 24
A developer needs to model out LookML to convert existing reports into Looker. The existing reports are:
Report 1: A report with order and order_items data, which finds the order with the largest total value of the order_item prices.
Report 2: A report with order and order_items data, which finds the order with the largest total number of products ordered.
Report 3: A report with data on every product, whether or not it has been ordered.
Each database table used is updated in real time as orders are made.
How should the developer construct an Explore using the order_items view as the base view?
- A. Create one persistent derived table to calculate Reports 1 and 2, and join in the products view with a full_outer join.
- B. Create one ephemeral derived table to calculate Report 1, create one ephemeral derived table to calculate Report 2, and join in the products view with a left_outer join.
- C. Create one ephemeral derived table to calculate Reports 1 and 2, and join in the products view with a full_outer join.
- D. Create one persistent derived table to calculate Report 1, create one persistent derived table to calculate Report 2, and join in the products view with a full_outer join.
Answer: D
NEW QUESTION 25
After validating LookML code, a developer receives the following error message:
"Unknown or Inaccessible Field users.name"
What is causing this error?
- A. The field is set to "hidden".
- B. There is a missing join.
- C. The join relationship is incorrect.
- D. The field uses incorrect SQL syntax.
Answer: B
NEW QUESTION 26
A developer has User Specific Time Zones enabled for a Looker instance, but wants to ensure that queries run in Looker are as performant as they can be. The developer wants to add a datatype: date parameter to all dimension_group definitions without time data in a table-based view, so that time conversions don't occur for these fields.
How can the developer determine to which fields this parameter should be applied through SQL Runner?
- A. Open the Explore query in SQL Runner and validate whether removing the conversion from date fields changes the results.
- B. Use the Describe feature in SQL Runner to determine which fields include time data.
- C. Open the Explore query in SQL Runner to determine which fields are converted.
- D. Use the CAST function in SQL Runner to ensure that all underlying fields are dates and conversions are not applied.
Answer: D
NEW QUESTION 27
A developer needs to implement three persistent derived tables (PDTs) as described below.
The PDTs need to be refreshed after the daily ETL pipeline adds incremental loads to the underlying tables.
Each PDT is built off of one underlying table in the database (one PDT per table).
The underlying tables for each PDT are updated one after the other, and a new row is added to an ETL log table each time a table is updated.
Due to the unpredictable nature of the ETL pipeline, each PDT does not refresh at the same time from day to day.
Each PDT takes over an hour to build, and to save on compute costs each PDT should only be refreshed once per day.
How can the developer set up the PDTs according to these requirements?
- A. Create three separate datagroups tied to three PDTs that run when each corresponding table's row count changes.
- B. Create three separate datagroups tied to three PDTs that run when a new row is added to the ETL log table.
- C. Create one datagroup tied to all three PDTs that runs when the total row count across all three tables changes.
- D. Create one datagroup tied to all three PDTs that parameterizes the view name for each PDT in the SQL trigger condition.
Answer: B
NEW QUESTION 28
After running the Content Validator, a developer can see the error "Unknown field".
Which two changes could cause this issue? (Choose two.)
- A. Explore label was changed from users to customers.
- B. Field type was changed from number to string.
- C. Field name was changed from id to user_id.
- D. Model name was changed from e_commerce to reporting.
- E. View name was changed from users to customers.
Answer: B,C
NEW QUESTION 29
A LookML developer creates an Explore that joins two views. The base view has information about users' interactions with the support team. The joined view contains data about the users. The support team using this Explore feels overwhelmed by the amount of data this Explore shows them and decides to just look at open tickets.
What should the developer add to the Explore in the model to achieve these requirements?
- A. A relationship definition
- B. The hidden parameter
- C. The sql_always_where parameter
- D. A filtered measure
Answer: A
NEW QUESTION 30
The daily_forecast Explore used by the sales team needs to be cached for 24 hours. All other Explores used by the sales team need to be cached for one hour.
What is a scalable way to configure this caching logic?
- A. Define two datagroups for the model. Create a persistent derived table (PDT) for the daily_forecast Explore, and apply datagroup_trigger to it using the datagroup for 24-hour caching.
- B. Define two datagroups for the model. Apply persist_with at the model level with the datagroup for 1-hour caching, and apply persist_with to daily_forecast with the datagroup for 24-hour caching.
- C. Define max_cache_age on daily_forecast Explores of 24 hours. Define max_cache_age on all other Explores for one hour.
- D. Define for the model one datagroup that caches for 1 hour. Create a persistent derived table (PDT) for the daily_forecast Explore, and apply sql_trigger_value to it selecting the current date.
Answer: B
NEW QUESTION 31
A developer wants to calculate the ratio of total sales from the orders view and total users from the users view.
Which two methods can be used to create a measure that meets these requirements? (Choose two.)
B)
C)
D)
E)
- A. Option C
- B. Option A
- C. Option B
- D. Option D
- E. Option E
Answer: A,B
NEW QUESTION 32
A developer is defining the users table within a view file in Looker. The users table will be available as an individual Explore and it will also be joined into other Explores, such as the products Explore. The developer needs to limit the fields visible in the products Explore without affecting the visibility of the fields in the users Explore.
How should the developer meet this requirement?
- A. Create duplicate dimensions and measures, one for the users Explore and one for the products Explore, and use the hidden parameter to modify the visibility of the fields.
- B. Use the fields parameter at the join level for the products Explore to specify which fields should be included and leave the users Explore as is.
- C. Create two view files for the users table. One view file will have all possible fields for the users Explore, and the other will have only the fields required for the products Explore.
- D. Use the hidden parameter in the users view file for the fields that should not come over to the products Explore and leave the users Explore as is.
Answer: B
NEW QUESTION 33
A LookML developer has created a model with many Explores in it. Business users are having a difficult time locating the Explore they want in the long list displayed.
Which two actions can the LookML developer take to improve the user interface? (Choose two.)
- A. Combine the Explores into just a few Explores that each join to many views.
- B. Apply the group_label parameter to organize the Explores under different headings.
- C. Apply the hidden parameter with a value of yes to Explores that only exist to power specific Looks, dashboards, or suggestion menus.
- D. Modify the business users' roles so they do not have this model in their model set.
- E. Apply the fields parameter so that each Explore has fewer fields in it.
Answer: A,D
NEW QUESTION 34
Users report that every time they change the filter on their Explore, the filters take a very long time to populate.
How can the developer improve the filtering experience with this Explore?
- A. Use an access_filter parameter to automatically apply filters.
- B. Add an always_filter parameter to restrict the filter suggestions.
- C. Add persistence to the base view of the Explore.
- D. Limit the filter suggestions using the suggestions parameter.
Answer: D
NEW QUESTION 35
A user is seeing an error in the Explore that indicates the primary key defined for a one-million-row table is not unique.
How can the developer use SQL Runner to troubleshoot quickly?
- A. Create a query that concatenates two columns to create a compound primary key.
- B. Create a query that counts how many occurrences of the primary key value are in the base view, and sort by count.
- C. Create a query that selects the primary key from the base view, and look for duplicates.
- D. Create a query that selects all the fields from the table, and sort by primary key.
Answer: A
NEW QUESTION 36
A developer wants to create a measure that shows the item count broken out by category. When a second, more granular dimension is added to the same query, the count broken out by category should still represent the original aggregation and be duplicated on each line. The business wants this "count" in "category" available in the Explore section without any additional work done by the end user. For example:
The Count column represents the count for each combination of Category and Item.
The Count in Category column represents the count for each Category only.
How can the developer address this need with a LookML object?
- A. Calculate the overall count using table calculations in the Explore.
- B. Create a measure filtered on Category, and make the filter value controlled by a parameter.
- C. Create a measure with type: sum_over_dimension, and make the dimension value controlled by a parameter.
- D. Calculate the measure using a derived table, and then join that derived table back into the Explore.
Answer: D
NEW QUESTION 37
The developer is creating an Explore that includes the product users, and orders views that will meet the following guidelines.
Joins between the orders and users views should not incur high performance costs.
Users of this Explore will primarily be looking at data from the orders view.
Users of this Explore should only be able to see orders from the retailer "Fashion.ly".
The only field the users need from the products view is product.name.
Which LookML should the developer use?
A)
B)
C)
D)
- A. Option B
- B. Option C
- C. Option A
- D. Option D
Answer: D
NEW QUESTION 38
Two developers are working on adding a new view to a project. Once both developers have finished their work in the view, the changes will be pushed to production.
Where should the developers write the LookML for this view?
- A. In the master branch, with both users writing to the branch
- B. In each of their personal branches, with each user writing code separately
- C. In a new shared branch created from the master branch
- D. In one user's personal branch, with both users writing to the branch
Answer: C
NEW QUESTION 39
A developer would like to add a new dimension of type: yesno for the enabled column in their users table. The column is of type: string in the database and returns yes and no values.
How should the developer define the yesno dimension?
A)
B)
C)
D)
- A. Option A
- B. Option B
- C. Option D
- D. Option C
Answer: A
NEW QUESTION 40
A LookML developer has written the following persistent derived table. It references orders_rollup, another persistent derived table that also rebuilds with the same SQL trigger value.
Which change is needed to guarantee that user_facts will always rebuild with the latest data from orders_rollup?
- A. Change the sql_trigger_value parameter for both persistent derived tables to a datagroup_trigger parameter, and set them to use the same datagroup.
- B. Change the orders_rollup view reference to the literal table name from the database's scratch schema.
- C. Change the sql_trigger_value parameter of user_facts to select the current date plus one hour, so it triggers an hour after orders_rollup.
- D. Change the orders_rollup view reference to ${orders_rollup.DERVIED_TABLE_NAME}
Answer: A
NEW QUESTION 41
Business users report that an ephemeral derived table tile on the dashboard is slow.
Information about the dashboard includes:
The dashboard filter is linked to the user attributes.
This tile usually takes approximately 5 minutes to complete running.
Which solution should be used to improve the dashboard load time?
- A. Use a conditional WHERE clause for Development Mode.
- B. Use index distribution_key or sort_key for this derived table.
- C. Persist the derived table.
- D. Build a user attribute filter into the Explore.
Answer: C
NEW QUESTION 42
A developer has a persistent derived table view called user_facts that contains aggregated data for each user. The developer needs to query the data from this table in another derived table view called user_region_facts.
Which strategy should the developer use to write the query for user_region_facts that will leverage the existing derived table?
- A. Copy the name of the database table in the scratch schema for the user_facts derived table.
- B. Use ${user_facts.SQL_TABLE_NAME} to reference the user_facts derived table.
- C. Write a subquery in the FROM clause and alias with ${user_facts}.
- D. Writhe the query form user_facts into a common table expression (WITH user_facts AS...).
Answer: D
NEW QUESTION 43
Users report that the main dashboard has been slow to show results.
Which two options should the developer evaluate to improve dashboard performance? (Choose two.)
- A. Number of databases used by dashboard elements
- B. Ratio of visualizations to text tiles
- C. Format used to deliver these reports
- D. Number of queries used by the dashboard
- E. Amount of data rendered for each query
Answer: B,D
NEW QUESTION 44
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