What is strong and weak entity set?
the enitity which is set primary key is said to be strong entity and the entity which does not set primary key is said to be weak entity.
A weak entity set can always be make into strong entity set by adding to its attribute of its identifying entity set. For a weak entity set, we add columns to the table corresponding to the primary key of the strong entity set on which the weak set is dependent.
Strong entity is an entity set that can uniquely identify a row. Weak entity is an entity set that can not identify a row uniquely. Weak entities are denoted by double rectangle box.
The primary key of a weak entity set is formed by taking the primary key of the strong entity set on which its existence depends (see Mapping Constraints) plus its discriminator. A strong entity set has a primary key. All tuples in the set are distinguishable by that key. A weak entity set has no primary key unless attributes of the strong entity set on which it depends are included. Tuples (a particular row) in… Read More
A weak entity is an entity set that does not have sufficient attributes so that it can form a primary key. A weak entity is depicted by drawing double rectangle in entity relationship diagrams. While a strong entity is an entity set that have sufficient attributes so that it can form a primary key.
An entity set that does not possess sufficient attributes to form a primary key is called a weak entity set. One that does have a primary key is called a strong entity set. The discriminator (or partial key) of a weak entity set is the set of attributes that distinguishes among all the entities of a weak entity set The existence of a weak entity set depends on the existence of a identifying entity set… Read More
An entity set may not have sufficient attributes to form a primary key is called weak entity set. One with primary key is called strong entity set.
why do we need weak entity in database when we can make it strong entity?
strong entity is the entity that can stand alone weak entity cannot be exist alone. usually strong entity represent an real world entity such as course , student, patient, ward, department, employee,.... etc but the weak entity represents the relationship between two entities, so in connot be exist alone, there must be two strong entities that the weak entity will connect.
The table that has primary key is strong entity and the table that has no primary key is weak entity
an entity set may not have sufficient attribute 2 form a primary key is called weak entity set.ex entity set payment has 3 attribute pay-no,pay-date, pay-amount.pay-no is a sequential no generated 4 each loan.each payment entity is distinct,payments 4 different loans may share the same payment no.thus entity set doent have a primary key,so it is a weak entity set. Placid04 bakhra,muzaffarpur,bihar.
the entity set departure which has only one attribute date is a weak entity set. this is because if each departure entity is distinct, different flights may have departure on same day, so different flights may share the same date value bbye
In contrast to the strong or regular entity, a weak entity is one that meets two conditions: 1. The entity is existence-dependent; that is, it cannot exist without the entity with which it has a relationship. 2. The entity has a primary key that is partially or totally derived from the parent entity in the relationship.
strong entity : in this the attributes must have values for instance . weak entity : in this the attributes may or may not have values for instance .
A weak entity can be identified uniquely only by considering the primary key of another (owner) entity.
A card set for Pokemon is a card battle set or a collectors set there are strong ones and weak ones
Entity - Table Entity Set - Rows in Table
it is weak and strong because it neutralises acids. So its strong not weak but weak not strong.
same as entity class or entity type or entity set
Strong bases are strong electrolytes, as are some weak bases. However, some weak bases, such as ammonia, are weak electrolytes.
A weak nuclear force is a force that is weak. A strong nuclear force is a force that is strong.
its an set of entity
what is a strong and weak alkali
strong and weak
strong and weak bases strong acids and strong bases weak acids and weak bases pure water and buffers
weak is not strong
entity set is term as a collection of logicaly related entities.
Strong in numbers, weak in technology. Strong with money, weak with allies.
it is neither a weak or strong acid it is a strong base
Screwdrivers can have weak or strong magnetism.
dependents in an organization
"Hey!" That has no rhythm: it is a single sound. However all utterances of more than one syllable have a rhythm of some kind of rhythm. Even something like "Hi there I'm nobody Can't you see?" Has a pronounced rhythm: "STRONG weak weak STRONG weak weak STRONG (pause) weak STRONG". It could easily be set to music--it has the same rhythm as that part of Burt Bacharach's "What's New Pussycat?" which goes "Pussycat, pussycat, I… Read More
the states did not want to give up their independence to a strong central government.As a result the articles set up a very weak central government. go si
depends if it is strong or weak your is they are weak they can not but when they are strong they can
Inbetween, rather strong, not very weak
weak and strong,it depends
Strong and weak are comparative terms. Compare it with something
Salts made up of 1)strong acid+strong base 2)strong acid+weak base 3)weak acid+strong base 4)weak acid+weak base
* Exotics: Strong on Tuners, but weak on Mussles * Tuners: Strong on Mussles, but weak on Exotics * Mussles: Strong on Exotics, but weak on Tuners
No, a weak acid is a weak electrolyte Strong electrolytes - strong acids, bases, salts, and ionic compounds
lets understand them all: 1.An Entity is a real world "thing" which have independent existence. 2.Entity type is a category. 3.entity type is strictly calling, "an instance of entity type". 4.An entity type defines a collection of entities that have the same attributes. 5.Entity set : the collection of all entities of a particular entity type in the database at any point of time is called Entity set.
Weak entity means an entity which doesnt uniquely exist and requires another foreign entity for its complete representation. For example, we have a University database and we have a table of departments having dept_id as its primary key. Now, a department cannot exist independently unless there is a university, so this entity needs university id as well to represent it.
Strong Acids and Bases are strong electrolytes weak acids and bases are weak electrolytes
strong - ionic or intermolecular weak - vanderwals forces
Storms can be strong, weak, or violent.
The opposite of weak is.... strong.
I'm pretty sure there is no such word as meanful, perhaps you meant meaningful? In any case the wording of the question is difficult to understand.
Strong acids or bases have strong electrolytes, and the weak acids or bases have weak electrolytes.
Lowest pH, strong acids, then weak acids, then salts of strong acids and strong bases, then salts of weak acids and strong bases, then weak bases, then strong bases. All very confusing!
a. Weak id and strong superego b. Weak ego and strong superego c. Strong id and strong ego d. Strong id and weak superego
yes, a strong electrolyte can be a weak acid. a strong electrolyte means a compound that can dissociate really well in solution. thus a strong electrolyte includes strong acids, strong bases, AND soluble compounds. if a weak acid is a really soluble compound like ammonium chloride, then it is a strong electrolyte even though it's a weak base. what's important is that the compound dissociated not whether it's a strong or weak acid. if a… Read More