213 questions collected
Blackrock has 213 published OA questions on OAHelper. Most reported topics: SQL, Logical Reasoning, Math, Attention to Detail, Oracle.
Selenium Java: Failure Page Source Capture
mediumWord-Score Flowchart: The Inner Loop Exit Test
mediumWord-Score Flowchart: Scoring a Consonant
mediumWord-Score Flowchart: The Outer Loop Counter
mediumThe Word That Is Not an Oracle SET Operator
mediumWhat a UNION of EMPLOYEES and JOB_HISTORY Returns
mediumRoot After Deleting and Reinserting 45 in the AVL Tree
hardOutput of operate on the Array-Encoded Tree
mediumIn-order Traversal of the Twelve-Key BST
mediumPost-order Traversal of the Twelve-Key BST
mediumPre-order Traversal of the Twelve-Key BST
mediumChange in the Number of Left Children After Mirroring
mediumRoot of the Tree After the Mirror Routine
mediumFlowchart Word Scorer: What Goes in Cell 4
mediumDepth of the Mirrored Binary Tree
mediumSpotting Wrong Customer IDs Against Contact Numbers
mediumTwo-Squares Flowchart: Splitting the Number
mediumFlowchart Word Scorer: What Goes in Cell 3
mediumConfirming Correct Contact Numbers for Five Customers
mediumTwo-Squares Flowchart: Marking the First Representation
mediumSpotting Wrong Contact Numbers for Five Customers
mediumMatching Drill and Cutter Part Numbers to Their Names
mediumPrime-Sum Flowchart: Advancing the Candidate
mediumMatching Punch and Reamer Parts to Their Part Numbers
mediumFlowchart Word Scorer: What Goes in Cell 1
mediumSeven in a Row: Which Pair Sits Together
mediumPrime-Sum Flowchart: Advancing the Trial Divisor
mediumDrill and Cutter Codes: Matching Numbers to Names
mediumMaximum Average Annual Growth from 1996 to 2000
mediumPrime-Sum Flowchart: Initialising the Trial Divisor
mediumHighest Five-Year Average Paper Production
mediumLargest Single-Year Growth in Paper Production
mediumPrime-Sum Flowchart: the Loop Termination Test
mediumPhone Numbers and Customer IDs: The Wrong Pairings
mediumMissing Term in the Series 1, 3, 2, 8, 5, __, 26
mediumWhich Word Comes Next
mediumFilling the CY Cell of a 3x3 Equal-Sum Grid
mediumMulti-Linked Structure Used for Storing Images
mediumPunches and Reamers: Which Part Numbers Are Right
mediumCoding CRYSTAL When ABSOLUTE Is 1CT4M5V2
mediumCoding PALLAVI in the DEEPALI Language
mediumContrapositive of John's Work-and-Pay Conditional
mediumInternal Storage Structure of a Relational Database
mediumValue of the Symbolic Expression
mediumFastest Average Annual Growth Over Five Years
mediumJuice-to-Pulp Ratio After a 300 g Apple Dries to 200 g
mediumMinimum and Maximum Nodes Traversed in a BST Search
mediumWhen Five Visitors at Intervals 1 to 5 Next Coincide
mediumWhat G Wanted to Become
hardFinding X When Ten More Men Save Twenty Days
mediumNew Root After Inserting 10 into the BST
mediumSeven in a Row: Who Sits Side by Side
mediumProbability of Rolling a Sum of Nine with Two Dice
mediumIncome Tax Increase and Implicit Assumptions
mediumFunction That Prints the In-Order Traversal
mediumProbability a Drawn Card Is a Spade or a Queen
mediumLargest Year-on-Year Jump in Paper Output
mediumLitres of 10% Solution Added to Reach 12% Salt
mediumFunction That Prints the Post-Order Traversal
mediumStoppage Minutes per Hour at 64 and 55 kmph
mediumData Sufficiency: Profit or Loss on Apples
mediumAVL Root After Deleting and Re-inserting 45
hardTotal Principal from Matching Simple and Compound Interest
mediumFunction That Prints the Pre-Order Traversal
mediumSugar Expenditure After a 20% Price Rise and 25% Cut
mediumMirroring a BST: The Root Afterwards
mediumCompleting the preOrder Scanner for the Prefix Form
hardRatio Expression from a/b = 2/3 and c/b = 3/2
mediumSyllogism: All Jokers Are Kings, Some Kings Are Red
mediumMirroring a BST: Change in Left-Child Count
mediumPostfix Form of a Parenthesised Expression
mediumCost of R Pens and R Markers
mediumReturn Value of operate(root, 4) on a Seven-Node Tree
mediumPrefix Form of a Parenthesised Expression
mediumData Sufficiency: Whose Savings Are the Highest
mediumWhat the Recursive operate() Function Does
mediumInterleaved Squares Series: 1, 3, 2, 8, 5, ?, 26
mediumBST In-order Traversal of a Twelve-Key Insert
mediumCompleting a Nine-Number Equal-Sum Grid
mediumBST Post-order Traversal of a Twelve-Key Insert
mediumWhat the Three-Table SELECT Represents
mediumWhich Symbol-Substituted Inequality Is False
mediumBST Pre-order Traversal of a Twelve-Key Insert
mediumUNION ALL of Two Single-Row Queries
mediumReturn Value of CONNECT_BY_ISCYCLE
mediumTwo Typists, One Three Times Faster
mediumData Sufficiency: Counting the Girls in a Class
mediumWhich Statement Follows From a Compound Conditional
mediumUnique Combinations of Two Columns
easyRam's Maximum Average Weekly Wage
hardJuice to Pulp in a Dried Apple
mediumEngine Power: Compensating a Bore Increase
mediumEmployees with More Than Ten Years of Service
mediumFive Visitors on Different Cycles Meet Again
mediumFour Friends, Ten Hotels, At Least One Shared
mediumCreating a View over Column Aliases
mediumTen Extra Men Finish Twenty Days Sooner
mediumGuaranteed Divisor of Three Consecutive Even Numbers
mediumColumn Count of a Cross Join
mediumRolling a Total of Nine With Two Dice
easyVowels Together in MULTIPLE
mediumNested ROUND, TRUNC and MOD on 1600
mediumSpade or Queen From a Standard Deck
easyMen and Boys Painting a Wall
mediumCharacter Function That Returns a Number
mediumWhen Two Simple Interests Coincide
mediumGroup Function for a Department Sales Total
easyDiluting a 20% Salt Solution Down to 12%
mediumEight Friends in a Circle: Which Statement Holds
hardMinutes a Train Stops per Hour
mediumRounding a Date to the Nearest Year
mediumSix-Month Sales Graph: Best Average Monthly Growth
hardSplit Savings Across Simple and Compound Bonds
mediumSix-Month Sales Graph: Minimum Total Revenue
mediumSugar Bill After a Price Rise and a Consumption Cut
mediumHow NVL2 Differs from NVL
mediumSix-Month Sales Graph: Highest Average Revenue
mediumCLOB Result Exceeding the Maximum Length
mediumTrains and Platform: Pick the Valid Deduction
mediumArithmetic Operator for a Product
easyGrocer's Apple Profit Expression
mediumPart Catalogue: Matching the Mild Steel Washer
mediumCorrect Definition of a View
easyMilkman's Extra Water and Extra Price
mediumPart Catalogue: Spotting the Ball-Bearing Match
mediumValid Representation of DDL
easyRatio Algebra: Squares of a and c Over b
mediumAnnual Compensation with a Monthly Bonus
mediumMarble Game Flowchart: The Termination Test
mediumWhich Is Not a Valid Character Set
easyAddress Register Lookup: Barbara Richart
easyMarble Game Flowchart: Keeping the Score Non-Negative
mediumAddress Register Lookup: Lucille Gordon
easyMarble Game Flowchart: Scoring the Blue Pair
mediumAddress Register Lookup: Jessica Pope
easyDefault Precision of INTERVAL YEAR TO MONTH
mediumMarble Game Flowchart: The First Decision
mediumPart Catalogue Audit: Feed Arm Lever Cam Roll Code
easyMedian Flowchart: Choosing the Median Formula in Cell 5
mediumPart Catalogue Lookup: Spotter Head Clamp
easyMedian Flowchart: The Pass-End Test in Cell 4
mediumPart Catalogue Audit: Spotter Plungers Code
easyMedian Flowchart: The Comparison in Cell 2
mediumWhich SET Operator Does Not Exist
easyPole in the River: Deducing Its Length from the Rise
mediumRecovering a View's Defining Query
mediumThe Parts of a Python List Comprehension
easyUNION Across EMPLOYEES and JOB_HISTORY
mediumCustomer Directory: The Only Correct Pairing
mediumSum-of-Two-Squares Flowchart: Cell 5
mediumCustomer Directory: Both Pairings Wrong
mediumSum-of-Two-Squares Flowchart: Cell 4
mediumCustomer Directory: Isolating the Wholly Incorrect Pairings
mediumSum-of-Two-Squares Flowchart: Cell 2
hardPrinting Three Unpacked Values in Python 2
mediumSum-of-Two-Squares Flowchart: Cell 1
mediumList Comprehension Producing [5, 5, 8] from a Matrix
mediumImplicit Assumptions Behind a Productivity Bonus
mediumCoded Operations: Evaluating F(F(E12 A E16) C F(50 B 5 C 5))
mediumConverting a List of Months to a Set
mediumSeven-Digit Numbers from a Digit Set Containing Zero
mediumSix People on a Line: Who Are Neighbours
mediumData Sufficiency: The Class Average in Mathematics
mediumThree-Product Sales Chart: The Peak Month
mediumDiamonds, Thieves and Angels: What Kathy Keeps
mediumAverage Speed over Two Legs in Ratio 2 : 3
mediumData Sufficiency: Is x - y Positive
mediumProbability of Centuries in Four Specified Matches
mediumLoss in Value When a Diamond Breaks in Three
mediumReaping the Field with More Men and Longer Days
mediumTwenty Percent Shorter, But How Much Taller
mediumPart Catalogue: Which Spring Code Matches Its Description
mediumLeast Digit Making 451?603 Divisible by 9
easyGames, Sports and Gambles: Which Conclusion Always Follows
mediumDoubling the Selling Price Quadruples the Profit
mediumListing Departments Chronologically by Formation Date
mediumClassifying CREATE, SELECT, MERGE, RENAME, DROP and DELETE
mediumWhich Employee Name Matches LIKE 'jack%'
mediumClauses Allowed in the SELECT That Defines a View
mediumResult of ABS(+45) + ABS(-15) From DUAL
easyRows Returned by sal > ANY Intersected with sal < ALL
mediumSelecting ROWNUM From DUAL Filtered on ROWNUM
mediumEnsuring salary * Hike_percent Always Displays a Value
mediumSingle Row Functions Versus Multiple Row Functions
mediumWhich Statement About a Database Table Is True
mediumThe Relational Principle Behind SELECT Search Criteria
mediumWhich SQL Category the INSERT Statement Belongs To
easyDECODE Compared Against a NULL Search Value
mediumWhich Statement About the Set Operators Is True
mediumFunction That Manipulates Character, Number or Date Columns
mediumCASE Expression Substituting 99 for a NULL Commission
mediumRecovering the Base Query of a Forgotten View
mediumOutput of Sub.method Chaining Back to Super.method
mediumValid Data Types for a Dictionary Key in Python
mediumSetting Trace Hooks to Monitor Functions in a Program
mediumWhich Empty Class Definitions Run Without Error
mediumComparing Two Sets After update With Existing Members
mediumOpening a Text File for Reading in Python
easyJoining a Path List with '/'.join
easyCalling str.partition With No Argument
mediumCentring a String to Width 24 with Asterisks
mediumResult of s[:1] + s[1:] for Any String
easyCoding Language: RAINDROP Written as TCKPBPMN
mediumBuild the List [3, 2, 1, 0, 1, 4] with append
mediumMedian Flowchart: Recording That a Swap Happened
mediumMedian Flowchart: Initialisation Before the Sort Loop
mediumSprinter Speed Ratio Before and After Coaching
mediumFew-Shot Prompting: What Drives the Improvement
mediumPrimary Benefit of k-Fold Cross Validation
mediumEmbeddings Represent Text As
easyEffect of Low Sampling Temperature
mediumMinimum Height
mediumAirport Baggage Handling System
easy