What is level of data in a table?
When you use the hierarchical view of the data, you can define the level at which each table is generated. The level that you choose affects the figures that are shown in the cells of the table. … This topic uses the Household sample data set to illustrate how data is generated at different levels.
What is the command to check table in SQL?
SQL command to list all tables in Oracle
- Show all tables owned by the current user: SELECT table_name FROM user_tables;
- Show all tables in the current database: SELECT table_name FROM dba_tables;
- Show all tables that are accessible by the current user:
What is level in SQL?
The term LEVEL refers to a Pseudocolumn in Oracle which is used in a hierarchical query to identify the hierarchy level (parent->child) in numeric format. The LEVEL returns 1 for root row, 2 for child of root row and so on, as tree like structure. LEVEL must be used with CONNECT BY Clause.
What are table level constraints in SQL?
Table-level constraints refer to one or more columns in the table. Table-level constraints specify the names of the columns to which they apply. Table-level CHECK constraints can refer to 0 or more columns in the table.
What is level of granularity of a fact table?
The granularity is the lowest level of information stored in the fact table. The depth of data level is known as granularity. In date dimension the level could be year, month, quarter, period, week, day of granularity. The factors of determination will be resent to the requirements.
How can check table changes in SQL Server?
Query the sys. objects table to find the objects that changed and filter by modify_date and type ; U = User table, P = Stored procedure. This approach will tell you what objects have changed, but not the specific changes.
How can I see tables in SQL Server?
Using SQL Server Management Studio
- In Object Explorer, select the table for which you want to show properties.
- Right-click the table and choose Properties from the shortcut menu. For more information, see Table Properties – SSMS.
How do you check if a table is corrupted in SQL?
There is a very general single line query to check the corruption in the database – SELECT * FROM msdb. dbo. suspect_pages. If there is no error in the database, then the result will show no rows.
How do you query a hierarchy in SQL?
START WITH specifies the root or parent row(s) of the hierarchy. CONNECT BY specifies the relationship between the parent rows and child rows of the hierarchy. The NOCYCLE parameter instructs the database to return rows from a query even if a cyclic relation (CONNECT BY LOOP) exists in the data.
How do you collect table statistics?
To re-collect the statistics on a table, enter the ANALYZE statement as many times as necessary or use the DBMS_STATS package. By collecting statistics on the Text domain index, the cost-based optimizer in Oracle Database is able to perform the following tasks: Estimate the selectivity of the CONTAINS predicate.
Can you nest tables in SQL?
In order to create a nested table, the two source tables must contain a defined relationship so that the items in one table can be related to the other table. In SQL Server Data Tools, you can define this relationship in the data source view.
How view is created and dropped?
We can create a view by selecting fields from one or more tables present in the database. A View can either have all the rows of a table or specific rows based on certain condition. In this article we will learn about creating , deleting and updating Views. We can create View using CREATE VIEW statement.
Which constraints Cannot be applied at the table level?
Why Null Constraint cannot be used at table level.
Is primary key table level constraint?
PRIMARY KEY constraints can be defined at the table level. However, if you only want the constraint to apply to a single column, it can be applied at the column level.