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The columns represent groups or families of elements. There are 18 of them.
They represent the valance electrons in each element. Roman numerals do no represent the valence electrons but it is the group number given by mendeleef.
Each column on the periodic table is called group.There are 18 groups in total.For example 17th group belongs to Halogens.
the number of protons
Each row on the periodic table is called a period, while each column is called a group.
At the top of each column of each table.
Field
Field
The columns represent groups or families of elements. There are 18 of them.
Each column in a database table represents an attribute reg. the data that is held in that table. For ex: Table Employee can contain employee number, name, age, date of joining etc. Each of these items would be stored as individual columns in the Employee table.
Each column in a database table represents an attribute reg. the data that is held in that table. For ex: Table Employee can contain employee number, name, age, date of joining etc. Each of these items would be stored as individual columns in the Employee table.
Column names do not have to be unique within a database; they only have to be unique within a particular table. If a query joins two table where each contains a field with the same name and that field is specified in the SELECT or WHERE clause, not qualifying the column name with the table name results in ambiguity as to which field is desired.
In a table, a field is a column that contains specific information or data about one aspect of the entity being stored in the table. Each field represents a particular attribute or characteristic of the data being stored.
In a Microsoft Access table each column shows the information in a field. Each row shows a record.
In the context of it being a database, then the row of values would represent a field in that database.
For databases, a field is another name for a column in the table. Each record (or row) represents an incidence of one or more fields, each with its own data.
Each column is a group of chemical elements.