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When you sort data in query the record in the underlying table are actually?
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What is a correlated query?
Correlated query has a subquery in it which accesses the column name of a table alias which is outside the subquery.
What does it means not qualify a column in using clause?
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.
What does a row and column represent in a data table?
A row represents a record and a column represents a field.
Explain referential integrity constraints in terms of relational algebra?
Referential integrity is a database concept that ensures that relationships between tables remain consistent. When one table has a foreign key to another table, the concept of referential integrity states that you may not add a record to the table that contains the foreign key unless there is a corresponding record in the linked table. It also includes the techniques known as cascading update and cascading delete, which ensure that changes made to the linked table are reflected in the primary table. By Mehari Tewelde
What is a Primary key in relation to functions and relations?
A primary key is the identifier in a table. It cannot contain values that are null, and it has to be unique for every record. For example, a driver's license number could be a primary key in a relational database table. Every driver is assigned to one unique identifier, or driver's license number, and no two driver's license numbers are identical.
When you sort data in a query the records in the underlying table are actually rearranged?
No. Most queries list off data, but does not affect the underlying data. Certain types of query can be used to change data in a table, but do not re-arrange the order of the data in the table itself. That is determined by the indexes, mainly the primary key. You can sort the data in the table itself and have it remain that way.
Can you transfer the record of one table to other table using sql query?
Yes Insert into table a Select * from table b Where [limit your data set]
What is the table or queries that provide the underlying data for a report are referred to as?
Record Source
What is the difference between update and append query?
Update queries modify information within a record at one or more fields at a time.Append queries copy complete records at a time, adding to the existing set of records in a table.For example, if an "Address" field needs to be changed for the records in a table, you can use an update query to make that change. If you have two tables with various "Customer Information" listings, you can use an append query to copy the records of one table to the other.
Explain the concept of database record and recordset?
A database record is a single row in a database. A recordset (or cursor) represents a query, and looks like (part of) a record or row. It is actually a row of the query, or virtual table representing the query. When you submit a query that returns data, you create a recordset and the database fills it in with the first record that matches the predicate clause. You do what you need to do with that data. When you need the next record, you fetch the next row, and so on and so forth. Some recordsets represent more than one row at a time. That is up to the database and your program design, but the concept is the same - the recordset is all or part of the resultset from the query.
What are 2 ways to add a record to a table in Access?
You can enter it through the datasheet. You can enter it through a form. You can also use an Append Query to add records to a table from another table.
What is the difference between query datasheet and a table datasheet?
A query datasheet displays the results of a query operation, showing data based on specified criteria or calculations. A table datasheet displays the data in a table format, representing information stored in a database table. In essence, a query datasheet is derived from a table datasheet and is dynamic based on the query criteria.
If you delete query does it delete the original information in the table?
Your question is unclear. If you mean if you delete a query, then it does not affect the data in the table. Deleting any kind of query does not affect the data in any table it uses. If you mean if you run a Delete query, then yes the data in the table will be deleted. That is what Delete queries are for.
Why create view in database?
A View is similar to a Table and can be mistaken for a table by a novice application developer. CREATE VIEW VIEW_NAME AS SQL QUERY Here the SQL Query includes the Select query on a table that is to be displayed as a View. The view is a read only structure that only displays contents from a table and the user cannot insert or update or delete any data in the underlying table. Views are generally created to impose access restrictions to a specific subset of users whom you do not want to give full access but at the same time want them to view the data.
Where does the destination table in an Append query show in the query grid?
It does not show in the query grid. On the Append To line you can pick the fields in the destination table that you want values to be appended to. The query grid is just for specifying what fields and records you want to be added to the destination table, so it only needs to show the source table.
What is query Optimization?
Queries of a database can be fast or slow. Depends on a lot of things. The size of the table, the amount of data you are requesting from the query, etc. One of the ways a dba can help query optimization, is by "updating statistics" on a table. Statistics of a table allows the query to find the most efficient way to gather the data from the table.
What is a sql virtual table called?
A SQL virtual table is called a "view". Views are virtual tables that contain the result set of a SELECT query and can be used to simplify complex queries or provide a layer of abstraction over the underlying tables.
