It is a table containing : various combinations of inputs and output desired for that particular combinations. It is similar to truth table.
These lookup tables abbr. as LUT. are used in programming CPLDs or FPGAs.
The lookup table means the memory location placed in the register of a microprocessor.
lookup is nothing but searching.if you give a key it searches the corresponding value .
hash key is an element in the hash table. it is the data that you will combine (mathematical) with hash function to produce the hash.
it is a value that is given in a another table
In computer science, a hash table, or a hash map, is a data structure that associates keys with values. The primary operation it supports efficiently is a lookup: given a key (e.g. a person's name), find the corresponding value (e.g. that person's telephone number). It works by transforming the key using a hash function into a hash, a number that is used as an index in an array to locate the desired location ("bucket") where the values should be. Hash tables support the efficient insertion of new entries, in expected O(1) time. The time spent in searching depends on the hash function and the load of the hash table; both insertion and search approach O(1) time with well chosen values and hashes.
ANSWER A hash table is a way to find data in an array, when you have a known key and an unknown value that corresponds to the key. You use a hashing function on the key to create an index into the hash table containing the value. In the ideal case, this directly returns the corresponding value. In the usual case, a collision can occur. This means that the hashed key points to multiple possible values. A hash table is usually used on large arrays that would take a long time to search using other methods. A hash table can be very fast and use very little memory, and does not require the array to be sorted. The source code is slightly more complicated than some search methods. With a poorly designed hashing function when the hashed keys do not correspond one-to-one with the values, the secondary search after a hash collision can take a large amount of time.
hashing algorithm contain two components - hashing function & collision. hashing is mechanism which generally used in random file organization to convert the record key value into address.
hash key is an element in the hash table. it is the data that you will combine (mathematical) with hash function to produce the hash.
temp table
The major advantage of a hash table is its speed. Because the hash function is to take a range of key values and transform them into index values in such a way that the key values are distributed randomly across all the indices of a hash table.
Lookup.
The lookup table in a microprocessor is a system that helps replace the runtime computations. It replaces them with an easier index operation.
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it is a value that is given in a another table
There is no lookup wizard in Excel. That is something you find in Access, when entering fields. It allows you to link one table to another table or to set a list of values that can be used when entering data. There are a number of lookup functions in Excel, but they do not have wizards associated with them. The lookup functions in Excel are for different purposes than the lookup wizard in Access is for.
The lookup wizard allows you to create a field that sources its data from a list of values of a field in another table or query.
There is no upper limit.
The best way is with a lookup table.
In excel it is the lowest value for a specific category or series in a lookup table.