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SQLite 筆記
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<li class="date">2018-02-23 (Fri)</li>
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<h1 id="Table-of-Contents">Table of Contents<a class="anchor-link" href="#Table-of-Contents">¶</a></h1><div class="toc" style="margin-top: 1em;"><ul class="toc-item" id="toc-level0"><li><span><a data-toc-modified-id="Prettier-output-1" href="http://localhost:8890/notebooks/content/20180222-SQLite-practice-1.ipynb#Prettier-output">Prettier output</a></span><ul class="toc-item"><li><span><a data-toc-modified-id="調整每一個-column-寬度-1.1" href="http://localhost:8890/notebooks/content/20180222-SQLite-practice-1.ipynb#調整每一個-column-寬度">調整每一個 column 寬度</a></span></li></ul></li><li><span><a data-toc-modified-id="在-sqlite3-shell-裡清空畫面-2" href="http://localhost:8890/notebooks/content/20180222-SQLite-practice-1.ipynb#在-sqlite3-shell-裡清空畫面">在 sqlite3 shell 裡清空畫面</a></span></li><li><span><a data-toc-modified-id="使用-SQL-script-建立-tables-3" href="http://localhost:8890/notebooks/content/20180222-SQLite-practice-1.ipynb#使用-SQL-script-建立-tables">使用 SQL script 建立 tables</a></span></li><li><span><a data-toc-modified-id="顯示目前的-tables-4" href="http://localhost:8890/notebooks/content/20180222-SQLite-practice-1.ipynb#顯示目前的-tables">顯示目前的 tables</a></span></li><li><span><a data-toc-modified-id="顯示-table-schema-5" href="http://localhost:8890/notebooks/content/20180222-SQLite-practice-1.ipynb#顯示-table-schema">顯示 table schema</a></span></li><li><span><a data-toc-modified-id="顯示-indexes-6" href="http://localhost:8890/notebooks/content/20180222-SQLite-practice-1.ipynb#顯示-indexes">顯示 indexes</a></span></li></ul></div>
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<p>這篇主要紀錄使用 SQLite shell 下 SQL Query 的指令。基本上在 shell 裡頭都是用 dot-command, 使用 <code>.help</code> 可以顯示所有可用的指令.</p>
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<h2 id="Prettier-output">Prettier output<a class="anchor-link" href="#Prettier-output">¶</a></h2><p>在 command-line program 裡頭使用的 response format</p>
<pre><code>.mode column
.headers on
</code></pre>
<p>Example output</p>
<pre><code>Code Name Price Manufacturer
---------- ---------- ---------- ------------
7 CD drive 90 2
9 Toner cart 66 3
</code></pre>
<h3 id="調整每一個-column-寬度">調整每一個 column 寬度<a class="anchor-link" href="#調整每一個-column-寬度">¶</a></h3>
<pre><code>.width 5 18 15
</code></pre>
<p>缺點是不同的 tables, 不同的 columns 需要的寬度不同, 要自己調整
要重置設定:</p>
<pre><code>.width 0</code></pre>
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<h2 id="在-sqlite3-shell-裡清空畫面_1">在 sqlite3 shell 裡清空畫面<a class="anchor-link" href="#在-sqlite3-shell-裡清空畫面">¶</a></h2><p>要看 OS 決定實際的 shell command</p>
<pre><code>.shell clear
</code></pre>
<p>除了 <code>clear</code> 以外, 其他 shell command都能使用, e.g.,</p>
<pre><code>.shell cd</code></pre>
</div>
</div>
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<h2 id="使用-SQL-script-建立-tables">使用 SQL script 建立 tables<a class="anchor-link" href="#使用-SQL-script-建立-tables">¶</a></h2><p>比方我們有一個 <code>create_tables.sql</code> 內容是：</p>
<pre><code>CREATE TABLE Departments (
Code INTEGER PRIMARY KEY,
Name varchar(255) NOT NULL ,
Budget decimal NOT NULL
);
INSERT INTO Departments(Code,Name,Budget) VALUES(14,'IT',65000);
</code></pre>
<p>我們可以用 <code>.read</code> dot-command 在 shell 跑該 script 建立 <code>Department</code> table:</p>
<pre><code>.read create_tables.sql</code></pre>
</div>
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<h2 id="顯示目前的-tables">顯示目前的 tables<a class="anchor-link" href="#顯示目前的-tables">¶</a></h2>
<pre><code>.tables</code></pre>
</div>
</div>
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<h2 id="顯示-table-schema">顯示 table schema<a class="anchor-link" href="#顯示-table-schema">¶</a></h2>
<pre><code>.schema <TABLE_NAME></code></pre>
</div>
</div>
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<h2 id="顯示-indexes">顯示 indexes<a class="anchor-link" href="#顯示-indexes">¶</a></h2>
<pre><code>.indexes
</code></pre>
<p>在 Table T 的 Column C 建立 index</p>
<pre><code>CREATE INDEX <INDEX_NAME> ON T(C);
</code></pre>
<p>砍掉 index</p>
<pre><code>DROP INDEX <INDEX_NAME></code></pre>
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