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nocodb/packages/noco-docs/dist/0.109.7/setup-and-usages/links/index.html

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aria-expanded="false" href="/0.109.7/developer-resources/accessing-apis">Developer Resources</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="/0.109.7/engineering/architecture">Engineering</a></div></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-1 menu__list-item"><a class="menu__link" href="/0.109.7/FAQs">FAQs</a></li></ul></nav></div></div></aside><main class="docMainContainer_gTbr"><div class="container padding-top--md padding-bottom--lg"><div class="row"><div class="col docItemCol_VOVn"><div class="theme-doc-version-banner alert alert--warning margin-bottom--md" role="alert"><div>This is documentation for <!-- -->NocoDB<!-- --> <b>0.109.7 - Old UI</b>, which is no longer actively maintained.</div><div class="margin-top--md">For up-to-date documentation, see the <b><a href="/">latest version</a></b> (<!-- -->Latest<!-- -->).</div></div><div class="docItemContainer_Djhp"><article><nav class="theme-doc-breadcrumbs breadcrumbsContainer_Z_bl" aria-label="Breadcrumbs"><ul class="breadcrumbs" itemscope="" itemtype="https://schema.org/BreadcrumbList"><li class="breadcrumbs__item"><a aria-label="Home page" class="breadcrumbs__link" href="/"><svg viewBox="0 0 24 24" class="breadcrumbHomeIcon_YNFT"><path d="M10 19v-5h4v5c0 .55.45 1 1 1h3c.55 0 1-.45 1-1v-7h1.7c.46 0 .68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">Product</span><meta itemprop="position" content="1"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">Links</span><meta itemprop="position" content="2"></li></ul></nav><span class="theme-doc-version-badge badge badge--secondary">Version: 0.109.7 - Old UI</span><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>Links</h1></header><h3 class="anchor anchorWithStickyNavbar_LWe7" id="supported-relationship-types">Supported relationship types:<a href="#supported-relationship-types" class="hash-link" aria-label="Direct link to Supported relationship types:" title="Direct link to Supported relationship types:">​</a></h3><ul><li>One to many<ul><li>A Table record in first table is related to more than one record of second table. But second table record maps to only one entry of first table</li><li>NocoDB refers to this category of relationship as <strong>has many</strong></li><li>For every <strong>has many</strong> relation defined, NocoDB augments <strong>belongs to</strong> relationship column in the adjacent table automatically</li><li>Example: Country <strong>has many</strong> Cities. (other way mapping &gt; City <strong>belongs to</strong> Country )</li></ul></li><li>Many to many<ul><li>A Table record in first table is related to more than one record of second table; second table record can also map to more than on record of first table.</li><li>NocoDB refers to this category of relationship as <strong>many to many</strong></li><li>For every <strong>many to many</strong> relation defined between tables, NocoDB augments <strong>many to many</strong> relationship column in the other table automatically</li><li>Example: Film <strong>has many</strong> Actors. Actor <strong>has many</strong> Films (works on many films)</li></ul></li></ul><p>Further details of relationship types can be found <a href="https://afteracademy.com/blog/what-are-the-different-types-of-relationships-in-dbms" target="_blank" rel="noopener noreferrer">here</a></p><p>From Release v0.111.0, table records can be connected through relationships using the <strong>Links</strong> column type.
It is important to note that, earlier supported column type <strong>LinkToAnotherRecord</strong> for creating relations is considered deprecated. While the old datatype is still supported for backward compatibility, it is no longer possible to create new fields of that type.</p><p>The main distinction between these two column types lies in how the contents are displayed within the cell when links are established between two tables. With the <strong>LinkToAnotherRecord</strong> column type, the cell displays the <strong>Primary value</strong> of the related records. On the other hand, the <strong>Links</strong> column type only shows the <strong>count</strong> of related records.
The decision to switch over to new column type was made to ensure better performance and scalability of the application, more so when the records &amp; the number of records in the related table is large.</p><p>Child list to display the related records can be accessed by clicking on the link count displayed on the cell.
Except for the column type, the following procedures remain same as before </p><ul><li>Create, update &amp; delete a relationship column, </li><li>Link &amp; unlink a record, </li><li>Create a lookup and rollup columns </li></ul><p>Workflow details are captured below.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="adding-a-relationship">Adding a relationship<a href="#adding-a-relationship" class="hash-link" aria-label="Direct link to Adding a relationship" title="Direct link to Adding a relationship">​</a></h2><p><img loading="lazy" src="https://github.com/nocodb/nocodb/assets/86527202/b3762fc8-4bba-42ef-8415-41428840ee0e" alt="Screenshot 2023-06-27 at 11 03 20 AM" class="img_ev3q"></p><ol><li><p>Create column
Click on &#x27;+&#x27; button at end of column headers</p></li><li><p>Update column name
Input name in the text box provided</p></li><li><p>Select column type
Select Column type as &quot;Links&quot; from the drop-down menu</p></li><li><p>Choose relationship type</p></li></ol><ul><li>&#x27;Has Many&#x27; corresponds to the &#x27;One-to-many&#x27; relationships</li><li>&#x27;Many To Many&#x27; corresponds to the &#x27;Many-to-many&#x27; relationships</li></ul><ol start="5"><li><p>Select child table from drop down menu</p></li><li><p>Click on &#x27;Save&#x27;
A new column will get created in both the parent table &amp; child table</p></li></ol><h2 class="anchor anchorWithStickyNavbar_LWe7" id="linking-records">Linking records<a href="#linking-records" class="hash-link" aria-label="Direct link to Linking records" title="Direct link to Linking records">​</a></h2><h3 class="anchor anchorWithStickyNavbar_LWe7" id="1-open-link-record-tab">1. Open link record tab<a href="#1-open-link-record-tab" class="hash-link" aria-label="Direct link to 1. Open link record tab" title="Direct link to 1. Open link record tab">​</a></h3><p>Click on the &#x27;+&#x27; icon in corresponding row - cell
<img loading="lazy" src="https://github.com/nocodb/nocodb/assets/86527202/96a90a6d-544e-4e43-b6d1-fe1aef784257" alt="Screenshot 2023-06-27 at 11 06 52 AM" class="img_ev3q"></p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="2-select-from-the-option-displayed">2. Select from the option displayed<a href="#2-select-from-the-option-displayed" class="hash-link" aria-label="Direct link to 2. Select from the option displayed" title="Direct link to 2. Select from the option displayed">​</a></h3><p>Use &#x27;Filter box&#x27; to narrow down on search items.<br>
<!-- -->You can opt to insert a new record as well, using &quot;+ New Record&quot; button.<br>
<!-- -->You can use <code>ALT + Click</code> to insert multiple options together. </p><p><img loading="lazy" src="https://github.com/nocodb/nocodb/assets/86527202/68246783-8d01-488b-8926-644fca8fa164" alt="Screenshot 2023-06-27 at 11 08 40 AM" class="img_ev3q"></p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="3-column-display-for-has-many-relationship">3. Column display for &quot;Has Many&quot; relationship<a href="#3-column-display-for-has-many-relationship" class="hash-link" aria-label="Direct link to 3. Column display for &quot;Has Many&quot; relationship" title="Direct link to 3. Column display for &quot;Has Many&quot; relationship">​</a></h3><p>Country &#x27;has many&#x27; City</p><p><img loading="lazy" src="https://github.com/nocodb/nocodb/assets/86527202/b5bb62b7-37ad-480e-8bf2-d666b775b07a" alt="Screenshot 2023-06-27 at 11 11 50 AM" class="img_ev3q"></p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="4-column-display-for-belongs-to-relationship-automatically-updated">4. Column display for &quot;Belongs to&quot; relationship <!-- -->[Automatically updated]<a href="#4-column-display-for-belongs-to-relationship-automatically-updated" class="hash-link" aria-label="Direct link to 4-column-display-for-belongs-to-relationship-automatically-updated" title="Direct link to 4-column-display-for-belongs-to-relationship-automatically-updated">​</a></h3><p>City &#x27;belongs to&#x27; Country.<br>
<!-- -->Note: Primary value is still used as cell display value for &quot;Belongs to&quot; as it can have only one associated record.</p><p><img loading="lazy" src="https://github.com/nocodb/nocodb/assets/86527202/54e9ee75-4af5-49f6-8cd9-275dc53a8915" alt="Screenshot 2023-06-27 at 11 12 27 AM" class="img_ev3q"></p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="unlinking-records">Unlinking records<a href="#unlinking-records" class="hash-link" aria-label="Direct link to Unlinking records" title="Direct link to Unlinking records">​</a></h2><ol><li>Click on link count to open Child modal</li><li>Click on Unlink icon against required item</li></ol><p><img loading="lazy" src="https://github.com/nocodb/nocodb/assets/86527202/dad3cbc7-289d-45a7-9c49-a72264ed36b1" alt="Screenshot 2023-06-27 at 11 22 00 AM" class="img_ev3q"></p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="link-label-reconfiguration">Link label reconfiguration<a href="#link-label-reconfiguration" class="hash-link" aria-label="Direct link to Link label reconfiguration" title="Direct link to Link label reconfiguration">​</a></h2><p>Use column edit menu for <strong>Links</strong> to reconfigure display label</p><p><img loading="lazy" src="https://github.com/nocodb/nocodb/assets/86527202/1aabdd8c-7102-4917-b0c0-b72e1187b0b7" alt="Screenshot 2023-06-27 at 11 16 19 AM" class="img_ev3q"></p></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="theme-doc-footer-edit-meta-row row"><div class="col"><a href="https://github.com/nocodb/nocodb/tree/develop/packages/noco-docs/docs/versioned_docs/version-0.109.7/030.setup-and-usages/220.links.md" target="_blank" rel="noreferrer noopener" class="theme-edit-this-page"><svg fill="currentColor" height="20" width="20" viewBox="0 0 40 40" class="iconEdit_Z9Sw" aria-hidden="true"><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"></path></g></svg>Edit this page</a></div><div class="col lastUpdated_vwxv"></div></div></footer></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="/0.109.7/setup-and-usages/usage-information"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Usage Information</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/0.109.7/setup-and-usages/team-and-auth"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Team &amp; Auth</div></a></nav></div></div><div class="col col--3"><div class="tableOfContents_bqdL thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#supported-relationship-types" class="table-of-contents__link toc-highlight">Supported relationship types:</a></li><li><a href="#adding-a-relationship" class="table-of-contents__link toc-highlight">Adding a relationship</a></li><li><a href="#linking-records" class="table-of-contents__link toc-highlight">Linking records</a><ul><li><a href="#1-open-link-record-tab" class="table-of-contents__link toc-highlight">1. Open link record tab</a></li><li><a href="#2-select-from-the-option-displayed" class="table-of-contents__link toc-highlight">2. Select from the option displayed</a></li><li><a href="#3-column-display-for-has-many-relationship" class="table-of-contents__link toc-highlight">3. Column display for &quot;Has Many&quot; relationship</a></li><li><a href="#4-column-display-for-belongs-to-relationship-automatically-updated" class="table-of-contents__link toc-highlight">4. Column display for &quot;Belongs to&quot; relationship Automatically updated</a></li></ul></li><li><a href="#unlinking-records" class="table-of-contents__link toc-highlight">Unlinking records</a></li><li><a href="#link-label-reconfiguration" class="table-of-contents__link toc-highlight">Link label reconfiguration</a></li></ul></div></div></div></div></main></div></div><footer class="footer footer--dark"><div class="container container-fluid"><div class="footer__links text--center"><div class="footer__links"><a href="https://github.com/facebook/docusaurus" target="_blank" rel="noopener noreferrer" class="footer__link-item">GitHub<svg width="13.5" height="13.5" aria-hidden="true" viewBox="0 0 24 24" class="iconExternalLink_nPIU"><path fill="currentColor" d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"></path></svg></a><span class="footer__link-separator">·</span><a href="https://nocodb.com/" target="_blank" rel="noopener noreferrer" class="footer__link-item">Website<svg width="13.5" height="13.5" aria-hidden="true" viewBox="0 0 24 24" class="iconExternalLink_nPIU"><path fill="currentColor" d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"></path></svg></a><span class="footer__link-separator">·</span><a href="https://community.nocodb.com/" target="_blank" rel="noopener noreferrer" class="footer__link-item">Community<svg width="13.5" height="13.5" aria-hidden="true" viewBox="0 0 24 24" class="iconExternalLink_nPIU"><path fill="currentColor" d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"></path></svg></a><span class="footer__link-separator">·</span><a href="https://discord.gg/5RgZmkW" target="_blank" rel="noopener noreferrer" class="footer__link-item">Discord<svg width="13.5" height="13.5" aria-hidden="true" viewBox="0 0 24 24" class="iconExternalLink_nPIU"><path fill="currentColor" d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"></path></svg></a><span class="footer__link-separator">·</span><a href="https://twitter.com/nocodb" target="_blank" rel="noopener noreferrer" class="footer__link-item">Twitter<svg width="13.5" height="13.5" aria-hidden="true" viewBox="0 0 24 24" class="iconExternalLink_nPIU"><path fill="currentColor" d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"></path></svg></a></div></div><div class="footer__bottom text--center"><div class="margin-bottom--sm"><img src="/img/icon.png" alt="NocoDB" class="themedImage_ToTc themedImage--light_HNdA footer__logo" width="50"><img src="/img/icon.png" alt="NocoDB" class="themedImage_ToTc themedImage--dark_i4oU footer__logo" width="50"></div><div class="footer__copyright">Copyright © 2023 NocoDB</div></div></div></footer></div>
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