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  <section id="erd-tool">
<span id="id1"></span><h1><span class="target" id="index-0"></span>ERD Tool<a class="headerlink" href="#erd-tool" title="Link to this heading"></a></h1>
<p>The Entity-Relationship Diagram (ERD) tool is a database design tool that provides a graphical representation of database tables, columns, and inter-relationships. ERD can give sufficient information for the database administrator to follow when developing and maintaining the database. The ERD Tool allows you to:</p>
<ul class="simple">
<li><p>Design and visualize the database tables and their relationships.</p></li>
<li><p>Add notes to the diagram.</p></li>
<li><p>Auto-align the tables and links for cleaner visualization.</p></li>
<li><p>Save the diagram and open it later to continue working on it.</p></li>
<li><p>Generate ready to run SQL from the database design.</p></li>
<li><p>Generate the database diagram for an existing database.</p></li>
<li><p>Drag and drop tables from object explorer to the diagram.</p></li>
</ul>
<img alt="ERD tool window" class="align-center" src="_images/erd_tool.png" />
<p>You can open multiple copies of the ERD tool in individual tabs simultaneously.
You can also generate an ERD from a database, schema or a table.</p>
<ul class="simple">
<li><p>The ERD for database will fetch all the tables from all the schemas of the database and plot them with foreign key links.</p></li>
<li><p>The ERD for schema will fetch all the tables from a schema and plot them with foreign key links. If any table refers to a table in another
schema, then that link/foreign key will be removed.</p></li>
<li><p>The ERD for table will fetch all the tables linked directly or indirectly to mentioned table. You can change the depth of traversal from <a class="reference internal" href="preferences.html#preferences"><span class="std std-ref">Preferences</span></a>.</p></li>
</ul>
<section id="toolbar">
<h2>Toolbar<a class="headerlink" href="#toolbar" title="Link to this heading"></a></h2>
<p>The <em>ERD Tool</em> toolbar uses context-sensitive icons that provide shortcuts to frequently performed tasks. The option is enabled for the highlighted icon and is disabled for the grayed-out icon.</p>
<img alt="ERD tool toolbar" class="align-center" src="_images/erd_tool_toolbar.png" />
<p>Hover over an icon on Toolbar to display a tooltip that describes the icon’s functionality.</p>
</section>
<section id="file-options">
<h2>File Options<a class="headerlink" href="#file-options" title="Link to this heading"></a></h2>
<table class="longtable docutils align-default">
<colgroup>
<col style="width: 16.7%" />
<col style="width: 66.7%" />
<col style="width: 16.7%" />
</colgroup>
<thead>
<tr class="row-odd"><th class="head"><p>Icon</p></th>
<th class="head"><p>Behavior</p></th>
<th class="head"><p>Shortcut</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p><em>Open File</em></p></td>
<td><p>Click the <em>Open File</em> icon to load a previously saved diagram.</p></td>
<td><p>Ctrl + O</p></td>
</tr>
<tr class="row-odd"><td><p><em>Save</em></p></td>
<td><p>Click the <em>Save</em> icon to perform a quick-save of a previously saved diagram, or to save the
diagram to a file.</p></td>
<td><p>Ctrl + S</p></td>
</tr>
<tr class="row-even"><td><p><em>Save as</em></p></td>
<td><p>Click the <em>Save As</em> to open a new browser dialog and specify a new location to save the diagram.
You need to click the down arrow beside the save button to see <em>Save As</em>.</p></td>
<td><p>Ctrl + Shift +
S</p></td>
</tr>
</tbody>
</table>
</section>
<section id="export-options">
<h2>Export Options<a class="headerlink" href="#export-options" title="Link to this heading"></a></h2>
<table class="longtable docutils align-default">
<colgroup>
<col style="width: 16.7%" />
<col style="width: 66.7%" />
<col style="width: 16.7%" />
</colgroup>
<thead>
<tr class="row-odd"><th class="head"><p>Icon</p></th>
<th class="head"><p>Behavior</p></th>
<th class="head"><p>Shortcut</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p><em>Generate SQL</em></p></td>
<td><p>Click the <em>Generate SQL</em> icon to generate the DDL SQL for the diagram and open a query tool
with the generated SQL ready for execution.
You can select the option <em>With DROP Table</em> if you wish to have DROP Table DDL statements before
each CREATE Table DDL. You can see the option by clicking the down arrow beside the SQL button.</p></td>
<td><p>Option + Ctrl +
S</p></td>
</tr>
<tr class="row-odd"><td><p><em>Download image</em></p></td>
<td><p>Click the <em>Download image</em> icon to save the ERD diagram in a image formate</p></td>
<td><p>Option + Ctrl +
I</p></td>
</tr>
</tbody>
</table>
</section>
<section id="editing-options">
<h2>Editing Options<a class="headerlink" href="#editing-options" title="Link to this heading"></a></h2>
<table class="longtable docutils align-default">
<colgroup>
<col style="width: 16.7%" />
<col style="width: 66.7%" />
<col style="width: 16.7%" />
</colgroup>
<thead>
<tr class="row-odd"><th class="head"><p>Icon</p></th>
<th class="head"><p>Behavior</p></th>
<th class="head"><p>Shortcut</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p><em>Add table</em></p></td>
<td><p>Click this button to add a new table to the diagram. On clicking, this will open a table dialog
where you can put the table details.</p></td>
<td><p>Option/Alt +
Ctrl + A</p></td>
</tr>
<tr class="row-odd"><td><p><em>Edit table</em></p></td>
<td><p>Click this button to edit a table on the diagram. On clicking, this will open a table dialog
where you can change table details. This will enable when a table is selected.</p></td>
<td><p>Option/Alt +
Ctrl + E</p></td>
</tr>
<tr class="row-even"><td><p><em>Clone table</em></p></td>
<td><p>Click this button to clone the complete table structure, name it with a auto generated name and
put it in the diagram.</p></td>
<td><p>Option/Alt +
Ctrl + C</p></td>
</tr>
<tr class="row-odd"><td><p><em>Drop table/link</em></p></td>
<td><p>You can drop a table or link using this button. You need to select a table or link and click on
this button to drop it.</p></td>
<td><p>Option/Alt +
Ctrl + D</p></td>
</tr>
</tbody>
</table>
</section>
<section id="table-relationship-options">
<h2>Table Relationship Options<a class="headerlink" href="#table-relationship-options" title="Link to this heading"></a></h2>
<table class="longtable docutils align-default">
<colgroup>
<col style="width: 16.7%" />
<col style="width: 66.7%" />
<col style="width: 16.7%" />
</colgroup>
<thead>
<tr class="row-odd"><th class="head"><p>Icon</p></th>
<th class="head"><p>Behavior</p></th>
<th class="head"><p>Shortcut</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p><em>1M</em></p></td>
<td><p>Click this button to open a one-to-many relationship dialog to add a relationship between the
two tables. The selected table becomes the referencing table and will have the <em>many</em> endpoint of
the link.</p></td>
<td><p>Option/Alt +
Ctrl + O</p></td>
</tr>
<tr class="row-odd"><td><p><em>MM</em></p></td>
<td><p>Click this button to open a many-to-many relationship dialog to add a relationship between the
two tables. This option will create a new table based on the selected columns for the two relating
tables and link them.</p></td>
<td><p>Option/Alt +
Ctrl + M</p></td>
</tr>
</tbody>
</table>
</section>
<section id="node-color-options">
<h2>Node Color Options<a class="headerlink" href="#node-color-options" title="Link to this heading"></a></h2>
<table class="longtable docutils align-default">
<colgroup>
<col style="width: 16.7%" />
<col style="width: 83.3%" />
</colgroup>
<thead>
<tr class="row-odd"><th class="head"><p>Icon</p></th>
<th class="head"><p>Behavior</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p><em>Fill Color</em></p></td>
<td><p>Use Fill Color to change the background color of a table node. This is helpful if you want to
identify a of group tables. Once set, all the newly added tables will take the same color.</p></td>
</tr>
<tr class="row-odd"><td><p><em>Text Color</em></p></td>
<td><p>Use Text Color to change the text color of a table node based on the fill color to make text
easily readable.</p></td>
</tr>
</tbody>
</table>
</section>
<section id="utility-options">
<h2>Utility Options<a class="headerlink" href="#utility-options" title="Link to this heading"></a></h2>
<table class="longtable docutils align-default">
<colgroup>
<col style="width: 16.7%" />
<col style="width: 66.7%" />
<col style="width: 16.7%" />
</colgroup>
<thead>
<tr class="row-odd"><th class="head"><p>Icon</p></th>
<th class="head"><p>Behavior</p></th>
<th class="head"><p>Shortcut</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p><em>Add/Edit note</em></p></td>
<td><p>Click this button to make notes on tables nodes while designing the database.</p></td>
<td><p>Option/Alt +
Ctrl + N</p></td>
</tr>
<tr class="row-odd"><td><p><em>Auto align</em></p></td>
<td><p>Click this button to auto align all tables and links to make it look more cleaner.</p></td>
<td><p>Option/Alt +
Ctrl + L</p></td>
</tr>
<tr class="row-even"><td><p><em>Show details</em></p></td>
<td><p>Click this button to toggle the column details visibility. It allows you to show few or more
column details.</p></td>
<td><p>Option/Alt +
Shift + D</p></td>
</tr>
<tr class="row-odd"><td><p><em>Cardinality Notation</em></p></td>
<td><p>Change the cardinality notation format used to present relationship links. Options available
are - Crow’s Foot Notation and Chen Notation.</p></td>
<td></td>
</tr>
</tbody>
</table>
</section>
<section id="zoom-options">
<h2>Zoom Options<a class="headerlink" href="#zoom-options" title="Link to this heading"></a></h2>
<table class="longtable docutils align-default">
<colgroup>
<col style="width: 16.7%" />
<col style="width: 66.7%" />
<col style="width: 16.7%" />
</colgroup>
<thead>
<tr class="row-odd"><th class="head"><p>Icon</p></th>
<th class="head"><p>Behavior</p></th>
<th class="head"><p>Shortcut</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p><em>Zoom to fit</em></p></td>
<td><p>Click this button to zoom in/out automatically and fit all the tables to the view.</p></td>
<td><p>Option/Alt +
Shift + F</p></td>
</tr>
<tr class="row-odd"><td><p><em>Zoom in</em></p></td>
<td><p>Click this button to zoom in the diagram.</p></td>
<td><p>Option/Alt +
Shift + “+”</p></td>
</tr>
<tr class="row-even"><td><p><em>Zoom out</em></p></td>
<td><p>Click this button to zoom out the diagram.</p></td>
<td><p>Option/Alt +
Shift + “-”</p></td>
</tr>
</tbody>
</table>
</section>
<section id="table-dialog">
<h2>Table Dialog<a class="headerlink" href="#table-dialog" title="Link to this heading"></a></h2>
<img alt="ERD tool table dialog" class="align-center" src="_images/erd_table_dialog.png" />
<p>The table dialog allows you to:</p>
<ul class="simple">
<li><p>Change the table structure details.</p></li>
<li><p>It can be used edit an existing table or add a new one.</p></li>
<li><p>Refer <a class="reference internal" href="table_dialog.html#table-dialog"><span class="std std-ref">table dialog</span></a> for information on different fields.</p></li>
</ul>
</section>
<section id="table-node">
<h2>Table Node<a class="headerlink" href="#table-node" title="Link to this heading"></a></h2>
<img alt="ERD tool table node" class="align-center" src="_images/erd_table_node.png" />
<p>The table node shows table details in a graphical representation:</p>
<ul class="simple">
<li><p>The top bar has a <em>details toggle button</em> that is used to toggle column details visibility. There is also a <em>note button</em> that is visible only if there is some note added. you can click on this button to quickly change the note.</p></li>
<li><p>The first row shows the schema name of the table. Eg. <em>public</em> in above image.</p></li>
<li><p>The second row shows the table name. Eg. <em>users</em> in above image.</p></li>
<li><p>All other rows below the table name are the columns of the table along with data type. If the column is a primary key then it will have lock key icon eg. id is the primary key in above image. Otherwise, it will have column icon.</p></li>
<li><p>you can click on the node and drag to move on the canvas.</p></li>
<li><p>Upon double click on the table node or by clicking the edit button from the toolbar, the table dialog opens where you can change the table details. Refer <a class="reference internal" href="table_dialog.html#table-dialog"><span class="std std-ref">table dialog</span></a> for information on different fields.</p></li>
</ul>
</section>
<section id="the-one-to-many-link-dialog">
<h2>The One to Many Link Dialog<a class="headerlink" href="#the-one-to-many-link-dialog" title="Link to this heading"></a></h2>
<img alt="ERD tool 1M dialog" class="align-center" src="_images/erd_1m_dialog.png" />
<p>The one to many link dialog allows you to:</p>
<ul class="simple">
<li><p>Add a foreign key relationship between two tables.</p></li>
<li><p><em>Local Table</em> is the table that references a table and has the <em>many</em> end point.</p></li>
<li><p><em>Local Column</em> the column that references.</p></li>
<li><p><em>Referenced Table</em> is the table that is being referred and has the <em>one</em> end point.</p></li>
<li><p><em>Referenced Column</em> the column that is being referred.</p></li>
</ul>
</section>
<section id="the-many-to-many-link-dialog">
<h2>The Many to Many Link Dialog<a class="headerlink" href="#the-many-to-many-link-dialog" title="Link to this heading"></a></h2>
<img alt="ERD tool MM dialog" class="align-center" src="_images/erd_mm_dialog.png" />
<p>The many to many link dialog allows you to:</p>
<ul class="simple">
<li><p>Add a many to many relationship between two tables.</p></li>
<li><p>It creates a relationship tables having columns derived from the two tables and link them to the tables.</p></li>
<li><p><em>Left Table</em> is the first table that is to be linked. It will receive the <em>one</em> endpoint of the link with the new relation table.</p></li>
<li><p><em>Left Column</em> the column of the first table, that will always be a primary key.</p></li>
<li><p><em>Right Table</em> is the second table that is to be linked. It will receive the <em>one</em> endpoint of the link with the new relation table.</p></li>
<li><p><em>Right Column</em> the column of the second table, that will always be a primary key.</p></li>
</ul>
</section>
<section id="the-table-link">
<h2>The Table Link<a class="headerlink" href="#the-table-link" title="Link to this heading"></a></h2>
<img alt="ERD tool table link" class="align-center" src="_images/erd_table_link.png" />
<p>The table link shows relationship between tables:</p>
<ul class="simple">
<li><p>The single line endpoint of the link shows the column that is being referred.</p></li>
<li><p>The three line endpoint of the link shows the column that refers.</p></li>
<li><p>If one of the columns that is being referred or that refers is removed from the table then the link will get dropped.</p></li>
<li><p>you can click on the link and drag to move on the canvas.</p></li>
</ul>
</section>
<section id="the-table-notes">
<h2>The Table Notes<a class="headerlink" href="#the-table-notes" title="Link to this heading"></a></h2>
<img alt="ERD tool table note" class="align-center" src="_images/erd_table_note.png" />
<ul class="simple">
<li><p>You can use the notes popup to mark some notes while designing the database.</p></li>
<li><p>You open the pop-up using the toolbar note button.</p></li>
<li><p>If some note is added to a table then it will have notes button on the table node. You can click on the button to check/update notes.</p></li>
</ul>
</section>
</section>


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