Define Open Relationship
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Novice: Requires knowledge of the user interface on single-user computers. This article applies only to a Microsoft Access database (.mdb or .accdb).
This article describes how to define relationships in a Microsoft Access database. The article includes the following topics:
In a relational database, relationships enable you to prevent redundant data. For example, if you are designing a database that will track information about books, you might have a table named "Titles" that stores information about each book, such as the book's title, date of publication, and publisher. There is also information that you might want to store about the publisher, such as the publisher's telephone number, address, and ZIP Code/Postal Code. If you were to store all this information in the "Titles" table, the publisher's telephone number would be duplicated for each title that the publisher prints.
A better solution is to store the publisher's information only one time, in a separate table that we will call "Publishers." You would then put a pointer in the "Titles" table that references an entry in the "Publishers" table.
To make sure that you data stays synchronized, you can enforce referential integrity between tables. Referential integrity relationships help make sure that information in one table matches information in another. For example, each title in the "Titles" table must be associated with a specific publisher in the "Publishers" table. A title cannot be added to the database for a publisher that does not exist in the database.
Logical relationships in a database enable you to efficiently query data and create reports.
A relationship works by matching data in key columns, usually columns (or fields) that have the same name in both tables. In most cases, the relationship connects the primary key, or the unique identifier column for each row, from one table to a field in another table. The column in the other table is known as the "foreign key." For example, if you want to track sales of each book title, you create a relationship between the primary key column (let's call it title_ID) in the "Titles" table and a column in the "Sales" table that is named title_ID. The title_ID column in the "Sales" table is the foreign key.
There are three kinds of relationships between tables. The kind of relationship that is created depends on how the related columns are defined.
A one-to-many relationship is the most common kind of relationship. In this kind of relationship, a row in table A can have many matching rows in table B. But a row in table B can have only one matching row in table A. For example, the "Publishers" and "Titles" tables have a one-to-many relationship. That is, each publisher produces many titles. But each title comes from only one publisher.
A one-to-many relationship is created if only one of the related columns is a primary key or has a unique constraint.
In the relationship window in Access, the primary key side of a one-to-many relationship is denoted by a number 1. The foreign key side of a relationship is denoted by an infinity symbol.
In a many-to-many relationship, a row in table A can have many matching rows in table B, and vice versa. You create such a relationship by defining a third table that is called a junction table. The primary key of the junction table consists of the foreign keys from both table A and table B. For example, the "Authors" table and the "Titles" table have a many-to-many relationship that is defined by a one-to-many relationship from each of these tables to the "TitleAuthors" table. The primary key of the "TitleAuthors" table is the combination of the au_ID column (the "Authors" table's primary key) and the title_ID column (the "Titles" table's primary key).
In a one-to-one relationship, a row in table A can have no more than one matching row in table B, and vice versa. A one-to-one relationship is created if both of the related columns are primary keys or have unique constraints.
This kind of relationship is not common, because most information that is related in this manner would be in one table. You might use a one-to-one relationship to take the following actions:
In Access, the primary key side of a one-to-one relationship is denoted by a key symbol. The foreign key side is also denoted by a key symbol.
When you create a relationship between tables, the related fields do not have to have the same names. However, related fields must have the same data type unless the primary key field is an AutoNumber field. You can match an AutoNumber field with a Number field only if theFieldSizeproperty of both of the matching fields is the same. For example, you can match an AutoNumber field and a Number field if theFieldSizeproperty of both fields isLong Integer. Even when both matching fields are Number fields, they must have the sameFieldSizeproperty setting.
To create a one-to-many or a one-to-one relationship, follow these steps:
Close all tables. You cannot create or change relationships between open tables.
In Access 2002 or Access 2003, follow these steps:
In Access 2007, Access 2010, or Access 2013, click Relationships in the Show/Hide group on the Database Tools tab.
If you have not yet defined any relationships in your database, the Show Table dialog box is automatically displayed. If you want to add the tables that you want to relate but the Show Table dialog box does not appear, click Show Table on the Relationships menu.
Double-click the names of the tables that you want to relate, and then close the Show Table dialog box. To create a relationship between a table and itself, add that table two times.
Drag the field that you want to relate from one table to the related field in the other table. To drag multiple fields, press Ctrl, click each field, and then drag them.
In most cases, you drag the primary key field (this field is displayed in bold text) from one table to a similar field (this field frequently has the same name) that is called the foreign key in the other table.
The Edit Relationships dialog box appears. Make sure that the field names that are displayed in the two columns are correct. You can change the names if it is necessary.
Set the relationship options if it is necessary. If you have to have information about a specific item in the Edit Relationships dialog box, click the question mark button, and then click the item. (These options will be explained in detail later in this article.)
Click Create to create the relationship.
Repeat steps 4 through 7 for each pair of tables that you want to relate.
When you close the Edit Relationships dialog box, Access asks whether you want to save the layout. Whether you save the layout or do not save the layout, the relationships that you create are saved in the database.
You can create relationships not only in tables but also in queries. However, referential integrity is not enforced with queries.
To create a many-to-many relationship, follow these steps:
Create the two tables that will have a many-to-many relationship.
Create a third table. This is the junction table. In the junction table, add new fields that have the same definitions as the primary key fields from each table that you created in step 1. In the junction table, the primary key fields function as foreign keys. You can add other fields to the junction table, just as you can to any other table.
In the junction table, set the primary key to include the primary key fields from the other two tables. For example, in a "TitleAuthors" junction table, the primary key would be made up of the OrderID and ProductID fields.
To create a primary key, follow these steps:
Select the field or fields that you want to define as the primary key. To select one field, click the row selector for the desired field. To select multiple fields, hold down the Ctrl key, and then click the row selector for each field.
In Access 2002 or in Access 2003, click Primary Key on the toolbar.
In Access 2007, click Primary Key in the Tools group on the Design tab.
If you want the order of the fields in a multiple-field primary key to differ from the order of those fields in the table, click Indexes on the toolbar to display the Indexes dialog box, and then reorder the field names for the index named PrimaryKey.
Define a one-to-many relationship between each primary table and the junction table.
Referential integrity is a system of rules that Access uses to make sure that relationships between records in related tables are valid, and that you do not accidentally delete or change related data. You can set referential integrity when all the following conditions are true:
The following rules apply when you use referential integrity:
For relationships in which referential integrity is enforced, you can specify whether you want Access to automatically cascade update or cascade delete related records. If you set these options, delete and update operations that would usually be prevented by referential integrity rules are enabled. When you delete records or change primary key values in a primary table, Access makes the necessary changes to related tables to preserve referential integrity.
If you click to select the Cascade Update Related Fields check box when you define a relationship, any time that you change the primary key of a record in the primary table, Microsoft Access automatically updates the primary key to the new value in all related records. For example, if you change a customer's ID in the "Customers" table, the CustomerID field in the "Orders" table is automatically updated for every one of that customer's orders so that the relationship is not broken. Access cascades updates without displaying any message.
If the primary key in the primary table is an AutoNumber field, selecting the Cascade Update Related Fields check box has no effect because you cannot change the value in an AutoNumber field.
If you select the Cascade Delete Related Records check box when you define a relationship, any time that you delete records in the primary table, Access automatically deletes related records in the related table. For example, if you delete a customer record from the "Customers" table, all the customer's orders are automatically deleted from the "Orders" table. (This includes records in the "Order Details" table that are related to the "Orders" records). When you delete records from a form or datasheet when the Cascade Delete Related Records check box selected, Access warns you that related records may also be deleted. However, when you delete records by using a delete query, Access automatically deletes the records in related tables without displaying a warning.
There are three join types. You can see them in the following screen shot:
Option 1 defines an inner join. An inner join is a join in which records from two tables are combined in a query's results only if values in the joined fields meet a specified condition. In a query, the default join is an inner join that selects records only if values in the joined fields match.
Option 2 defines a left outer join. A left outer join is a join in which all the records from the left side of the LEFT JOIN operation in the query's SQL statement are added to the query's results, even if there are no matching values in the joined field from the table on the right side.
Option 3 defines a right outer join. A right outer join is a join in which all the records from the right side of the RIGHT JOIN operation in the query's SQL statement are added to the query's results, even if there are no matching values in the joined field from the table on the left side.
A relationship in which two people agree that they want to be together, but can't exactly promise that they won't see other people too. Basically, to have it all: a significant other and the freedom to hook up with other people. Common during college for many post-high school relationships.
"Are you still with Joe?"
"Well, we're in a open relationship now. And it's don't ask, don't tell."
"Are you okay with that?"
"You know, it IS college, and there are so many cute guys out there..."
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a spanish word meaning the flipflop
used by latin moms to beat their child's ass
Latin mom: DO U NOT FUCKING LISTEN CHILD
Latin child: OH SHIT NOT LA CHANCLA
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An open relationship is a relationship where one person does not own the other. The couple are not exclusively seeing each other and can date, flirt and hook up with other people should they wish to do so. In a true open relationship the couple will be fully honest with each other (unlike most regular relationships). They will not get pissed at each other for stupid things such as not ringing the day before, wearing a slutty top, passing out cold in a club, kissing that lesbian in the lift. Infact they will just love each other for who they are and support each other through times of need. Although other people will say they are sluts and it will never work, they onlys say this because they are jealous. In the end the couple will get bored of seeing other people because they realise they are the best two out there. Then they get married and have beautiful children. And retire together in Goa.
Couple in an open relationship:
Holly – “Get any luck last night?”
Jeremy - “Some nice assed latin girl”
Holly “As nice as me?”
Jeremy – “No Holly. Youre the best.”
Holly – “I know. Can you test me on my hindi?”
Jeremy – “Whats Pani”?
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To hold connection with and honor a significant other, while allowing both the individual freedom of choice to to live and love without limitations.
Q:" Are you and Michael still together?"
A: "Yes! We have an open relationship now."
Q:"Are you seeing other people?"
A: "Not at the moment. "
Q:"How do you know he isn't going to "
A: "I dont know what the future holds. I trust him and trust that we will discuss our feelings for other people. "
Q:"You're ok with that Kitty? Really ok? It sounds tricky"
A: "Yes! It may be challenging at times but even more so, it's rewarding. We support each other and are able to communicate through anything."
Q: "Why"
A: "I love Michael and want for him to experience all of what life has to offer"
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A term that allows you to give in to your slutty urges with other guys while having someone around at your disposal in the event that you're unable to hook up with anything hotter.
Nakita is in an open relationship. She is free to chat all day with guys.She is with the guy until she finds someone better.
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An open relationship is a relationship where both partners agree to see other people. Basically, it's permission to cheat.
Jane: "I hooked up with Joey last night!"
Hope: "Aren't you with John? So isn't that cheating?"
Jane: "We have an open relationship."
Hope: "That's what I said, cheating."
Jane: "But with permission."
by PurpleFuzzyBlanket August 23, 2010
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A "couple" that can't commit to a relationship. Basically just friends with benefits.
Boy: Hey you have a boyfriend?
Girl: Yeah, but we're in an open relationship. We can see other people.
Boy: So you have sex with other guys?
Girl: I can if I wanted to.
Boy: So you're basically a slut who covers it up by saying you're in an "open relationship."
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Open relationship - Wikipedia
Define relationships between tables in an Access... | Microsoft Docs
Urban Dictionary: open relationship
Define a relationship
How to define the relationship , according to relationship experts
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Define Open Relationship
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