Formatting SQL*Plus Reports
You can create relationships between lists by using a combination of unique columns, lookup source and target lists, creating unique and lookup columns, enforcing list relationship behavior, . See Manage lists and libraries with many items for more information on managing lists with many items. Date and Time. SQL: Counting Groups of Rows Sharing Common Column Values . task (listing years for which multiple album rows exist in the table). Column names are often short and cryptic, however, and expressions can be hard to understand. . The default width and format of unformatted DATE columns in SQL*Plus is See the FORMAT clause of the COLUMN command for more information on .. The following table lists compute functions and their effects.
You can also set a header and footer for each report. You can include multiple sets of clauses and CHAR values: To suppress the report header without changing its definition, enter REPHEADER OFF Positioning Title Elements The report in the preceding exercises might look more attractive if you give the company name more emphasis and place the type of report and the department name on either end of a separate line. It may also help to reduce the line size and thus center the titles more closely around the data.
Example Positioning Title Elements To redisplay the personnel report with a repositioned top title, enter the following commands: Note that there is no longer any space between the last row of the results and the bottom title.
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The last line of the bottom title prints on the last line of the page. The amount of space between the last row of the report and the bottom title depends on the overall page size, the number of lines occupied by the top title, and the number of rows in a given page.
In the above example, the top title occupies three more lines than the top title in the previous example. You will learn to set the number of lines per page later in this chapter.
For example, to skip one line before the bottom title in the example above, you could enter the following command: COL 15 places the title element in the 15th character position, indenting it 14 spaces.
PNO the current page number.
Example Displaying the Current Page Number in a Title To display the current page number at the top of each page, along with the company name, enter the following command: PNO has a format ten spaces wide. Listing, Suppressing, and Restoring Page Title Definitions To list a page title definition, enter the appropriate title command with no clauses: You may restore the current definitions by entering: You can reference a column value in a top title by storing the desired value in a variable and referencing the variable in a TTITLE command.
Next, include a label and the value in your page title, enter the proper BREAK command, and suppress the bottom title from the last example: If you want to print the value of a column at the bottom of the page, you can use the COLUMN command in the following form: Displaying the Current Date in Titles You can, of course, date your reports by simply typing a value in the title.
SQL: Counting Groups of Rows Sharing Common Column Values
For example, if someone tries to delete an order item from a target list, a customer might still have that order pending, and you want to prevent that delete operation from occurring until the order has been processed.
A cascade delete operation ensures all related items are deleted in one database transaction. A restrict delete operation prevents deleting items in the target list if related source list items exist. In short, enforcing a list relationship behavior helps keep your data valid and helps prevent inconsistencies that might cause problems down the road.
You must have Manage Lists permission on a list to create or modify an enforced relationship. A lookup column that enforces a relationship must also have an index. When you create a lookup column that enforces a relationship, you might be prompted to create the index, and it is automatically created when you click OK. Once a lookup column that enforces a relationship has an index, you cannot remove the index from that column, unless you first remove the enforced relationship.
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A lookup column with an unenforced relationship In a lookup column with an unenforced relationship, from the source list, you can lookup single or multiple values in the target list. Also, when you delete an item in the source list, as long as you have delete permission on the list, there are no additional delete restrictions or delete operations that occur in the target list. Viewing and editing items in list relationships One of the beneficial effects of creating list relationships is that you can display and edit columns from two or more lists, on one page.
When you create a lookup column in a source list, the primary column displays values from the target list column, but you can also specify that additional, secondary columns from the target list also display alongside the primary column and the other source list columns.
The primary column value is a link that you can click to the display all the column values of that item in the target list. Each secondary column value from the target list displays as text in the source list column.
If you create a lookup column with multiple values, each column from the target list, whether primary or secondary, display their multiple corresponding values delimited by semicolons. You can manipulate these primary and secondary columns in list view in much the same way as the columns from the source list, by, for example, adding, removing, filtering, and sorting them. The primary column name is a name you provide when you create the lookup column.
Changing the name of the primary column, therefore, changes the names of all secondary columns. However, you can modify the default secondary column names and descriptions to make the names more meaningful to you.
A primary lookup column with multiple values.