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Yang, Tong
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Reviewed-by: Hasko, Vladimir <vladimir.hasko@t-systems.com> Co-authored-by: Yang, Tong <yangtong2@huawei.com> Co-committed-by: Yang, Tong <yangtong2@huawei.com>
102 lines
9.7 KiB
HTML
102 lines
9.7 KiB
HTML
<a name="mrs_01_1408"></a><a name="mrs_01_1408"></a>
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<h1 class="topictitle1">About CarbonData Table</h1>
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<div id="body1595920209088"><div class="section" id="mrs_01_1408__scb4cf98e0e6c4e978b9db941d52f79a6"><h4 class="sectiontitle">Overview</h4><p id="mrs_01_1408__a66f4eb29431d4ae89f861bd15c16ed79">In CarbonData, data is stored in entities called tables. CarbonData tables are similar to RDBMS tables. RDBMS data is stored in a table consisting of rows and columns. CarbonData tables store structured data, and have fixed columns and data types.</p>
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</div>
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<div class="section" id="mrs_01_1408__s600fbee10995464a8dc9e041924de837"><h4 class="sectiontitle">Supported Data Types</h4><p id="mrs_01_1408__a9e2502cb96af44f787cb6a19f02dfe0c">CarbonData tables support the following data types:</p>
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<ul id="mrs_01_1408__ub7443a2004784af4b7357869b8d7fd22"><li id="mrs_01_1408__l7473deb690de4479b6dcc8249e489a8c">Int</li><li id="mrs_01_1408__l55b04babe206467c948ae255873733ac">String</li><li id="mrs_01_1408__lff3df56bb20c40fe80104526675012e2">BigInt</li><li id="mrs_01_1408__li02181435172310">Smallint</li><li id="mrs_01_1408__li59431840112316">Char</li><li id="mrs_01_1408__li1788174422314">Varchar</li><li id="mrs_01_1408__li17177144982316">Boolean</li><li id="mrs_01_1408__l8988e2e3958247788936f56bfb780f02">Decimal</li><li id="mrs_01_1408__l7970230fd6ba4a5eb1639db0035944f9">Double</li><li id="mrs_01_1408__lf19cc2e63d754c3d922270a15f1f8ddc">TimeStamp</li><li id="mrs_01_1408__l13bf8a0439dd42efb5dea19e3f2319d5">Date</li><li id="mrs_01_1408__li588420041818">Array</li><li id="mrs_01_1408__li39197381817">Struct</li><li id="mrs_01_1408__li674211681819">Map</li></ul>
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<p id="mrs_01_1408__a97069f72dfc34aa0a7fc555129f315b4">The following table describes supported data types and their respective values range.</p>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="mrs_01_1408__tef6b876fad9a44e19a73337b97e3d710" frame="border" border="1" rules="all"><caption><b>Table 1 </b>CarbonData data types</caption><thead align="left"><tr id="mrs_01_1408__r998298b9e0ee4e8aa69e7d0594674818"><th align="left" class="cellrowborder" valign="top" width="30.64%" id="mcps1.3.2.5.2.3.1.1"><p id="mrs_01_1408__a0c84c4019cd840ecbff6c0d3206e6b62"><strong id="mrs_01_1408__b18531237175410">Data Type</strong></p>
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</th>
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<th align="left" class="cellrowborder" valign="top" width="69.36%" id="mcps1.3.2.5.2.3.1.2"><p id="mrs_01_1408__af49f9908e6974a74bb5621dc481e433f"><strong id="mrs_01_1408__b86721943195413">Value Range</strong></p>
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</th>
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</tr>
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</thead>
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<tbody><tr id="mrs_01_1408__rd2f5d852a2bc452aaad901631d0051f0"><td class="cellrowborder" valign="top" width="30.64%" headers="mcps1.3.2.5.2.3.1.1 "><p id="mrs_01_1408__af2fdd14c20ae4d308bd30851d923b4b8">Int</p>
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</td>
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<td class="cellrowborder" valign="top" width="69.36%" headers="mcps1.3.2.5.2.3.1.2 "><p id="mrs_01_1408__a28d3263d7af04344a0565697980bd02b">4-byte signed integer ranging from -2,147,483,648 to 2,147,483,647.</p>
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<div class="note" id="mrs_01_1408__nf8a6e70e9c634ae0b03ee45ebd6acecf"><span class="notetitle"> NOTE: </span><div class="notebody"><p id="mrs_01_1408__a7bf1645da93945bc8f853cc1cbf0fee9">If a non-dictionary column is of the <strong id="mrs_01_1408__b11973547175410">int</strong> data type, it is internally stored as the <strong id="mrs_01_1408__b11978184712543">BigInt</strong> type.</p>
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</div></div>
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</td>
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</tr>
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<tr id="mrs_01_1408__rddf06a76469b4746beb3696d2a0afd7a"><td class="cellrowborder" valign="top" width="30.64%" headers="mcps1.3.2.5.2.3.1.1 "><p id="mrs_01_1408__a74695dcc2a7f40099ea2df338489d6f8">String</p>
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</td>
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<td class="cellrowborder" valign="top" width="69.36%" headers="mcps1.3.2.5.2.3.1.2 "><p id="mrs_01_1408__a896b1518b0ec4fd69ca381a4b7c01727">100,000 characters</p>
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<div class="note" id="mrs_01_1408__na68917bebadb484b95cf29ee4d004591"><span class="notetitle"> NOTE: </span><div class="notebody"><p id="mrs_01_1408__a959ed196cd434bc285a0d234c98491cf">If the <strong id="mrs_01_1408__b12341529135520">CHAR</strong> or <strong id="mrs_01_1408__b836613114553">VARCHAR</strong> data type is used in <b><span class="cmdname" id="mrs_01_1408__cmdname185615331390">CREATE TABLE</span></b>, the two data types are automatically converted to the String data type.</p>
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<p id="mrs_01_1408__p17277177810">If a column contains more than 32,000 characters, add the column to the <strong id="mrs_01_1408__b20984451145519">LONG_STRING_COLUMNS</strong> attribute of the <strong id="mrs_01_1408__b174301755105518">tblproperties</strong> table during table creation.</p>
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</div></div>
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</td>
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</tr>
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<tr id="mrs_01_1408__r2906aa4cdff84107a2da143b507ca09b"><td class="cellrowborder" valign="top" width="30.64%" headers="mcps1.3.2.5.2.3.1.1 "><p id="mrs_01_1408__aeb8596c52b2b47858ed041325878f229">BigInt</p>
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</td>
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<td class="cellrowborder" valign="top" width="69.36%" headers="mcps1.3.2.5.2.3.1.2 "><p id="mrs_01_1408__afd100283ac744f8e8ac6abc0776f9ca6">64-bit value ranging from -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807</p>
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</td>
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</tr>
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<tr id="mrs_01_1408__row1947361932617"><td class="cellrowborder" valign="top" width="30.64%" headers="mcps1.3.2.5.2.3.1.1 "><p id="mrs_01_1408__p74732193266">SmallInt</p>
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</td>
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<td class="cellrowborder" valign="top" width="69.36%" headers="mcps1.3.2.5.2.3.1.2 "><p id="mrs_01_1408__p047331922618">–32,768 to 32,767</p>
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</td>
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</tr>
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<tr id="mrs_01_1408__row181412302712"><td class="cellrowborder" valign="top" width="30.64%" headers="mcps1.3.2.5.2.3.1.1 "><p id="mrs_01_1408__p58146310273">Char</p>
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</td>
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<td class="cellrowborder" valign="top" width="69.36%" headers="mcps1.3.2.5.2.3.1.2 "><p id="mrs_01_1408__p16814937274">A to Z and a to z</p>
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</td>
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</tr>
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<tr id="mrs_01_1408__row13804193095118"><td class="cellrowborder" valign="top" width="30.64%" headers="mcps1.3.2.5.2.3.1.1 "><p id="mrs_01_1408__p19804330175111">Varchar</p>
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</td>
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<td class="cellrowborder" valign="top" width="69.36%" headers="mcps1.3.2.5.2.3.1.2 "><p id="mrs_01_1408__p780453075120">A to Z, a to z, and 0 to 9</p>
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</td>
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</tr>
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<tr id="mrs_01_1408__row21456355407"><td class="cellrowborder" valign="top" width="30.64%" headers="mcps1.3.2.5.2.3.1.1 "><p id="mrs_01_1408__p1514733524015">Boolean</p>
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</td>
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<td class="cellrowborder" valign="top" width="69.36%" headers="mcps1.3.2.5.2.3.1.2 "><p id="mrs_01_1408__p3147113516408"><strong id="mrs_01_1408__b15170103545612">true</strong> or <strong id="mrs_01_1408__b217514350561">false</strong></p>
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</td>
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</tr>
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<tr id="mrs_01_1408__reb327b19072e41b5be810415614be3eb"><td class="cellrowborder" valign="top" width="30.64%" headers="mcps1.3.2.5.2.3.1.1 "><p id="mrs_01_1408__ab5903455ae3644c0a8684cc52ea6d0e1">Decimal</p>
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</td>
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<td class="cellrowborder" valign="top" width="69.36%" headers="mcps1.3.2.5.2.3.1.2 "><p id="mrs_01_1408__a1b0dec0ac8bd4e449d357cbfb76d2a1b">The default value is (10,0) and maximum value is (38,38).</p>
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<div class="note" id="mrs_01_1408__nebe2151cfff74fbcb191a2be967bee90"><span class="notetitle"> NOTE: </span><div class="notebody"><p id="mrs_01_1408__aaf7a39d23c1343d3a3d76dc673981455">When query with filters, append <strong id="mrs_01_1408__b112204612561">BD</strong> to the number to achieve accurate results. For example, <strong id="mrs_01_1408__b17693204811563">select * from carbon_table where num = 1234567890123456.22BD</strong>.</p>
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</div></div>
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</td>
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</tr>
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<tr id="mrs_01_1408__r3f850cdbf20b49f2a5f81365a4147df2"><td class="cellrowborder" valign="top" width="30.64%" headers="mcps1.3.2.5.2.3.1.1 "><p id="mrs_01_1408__a85eb2d0433fa46a9be17cd290e4d65a0">Double</p>
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</td>
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<td class="cellrowborder" valign="top" width="69.36%" headers="mcps1.3.2.5.2.3.1.2 "><p id="mrs_01_1408__a8ed69253314b4b40b2a887a3207f0579">64-bit value ranging from 4.9E-324 to 1.7976931348623157E308</p>
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</td>
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</tr>
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<tr id="mrs_01_1408__r906e24fd1d194dfcb14223372b7a7962"><td class="cellrowborder" valign="top" width="30.64%" headers="mcps1.3.2.5.2.3.1.1 "><p id="mrs_01_1408__ad5efd5c17a1945feaeac3af762f163ef">TimeStamp</p>
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</td>
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<td class="cellrowborder" valign="top" width="69.36%" headers="mcps1.3.2.5.2.3.1.2 "><p id="mrs_01_1408__a6b8ad27afec748c29d8d18e221d2bd91">The default format is <strong id="mrs_01_1408__b118603570563">yyyy-MM-dd HH:mm:ss</strong>.</p>
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</td>
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</tr>
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<tr id="mrs_01_1408__r1277897f4fe44f79a6b4f67fe48d7c3c"><td class="cellrowborder" valign="top" width="30.64%" headers="mcps1.3.2.5.2.3.1.1 "><p id="mrs_01_1408__a53b7de4f613a4f958183723906e61d2d">Date</p>
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</td>
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<td class="cellrowborder" valign="top" width="69.36%" headers="mcps1.3.2.5.2.3.1.2 "><p id="mrs_01_1408__ae0ea50e379ce4fd6be0c6209649551fb">The <strong id="mrs_01_1408__b4378188571">DATE</strong> data type is used to store calendar dates. The default format is <strong id="mrs_01_1408__b206119108575">yyyy-MM-DD</strong>.</p>
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</td>
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</tr>
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<tr id="mrs_01_1408__row1294910421405"><td class="cellrowborder" valign="top" width="30.64%" headers="mcps1.3.2.5.2.3.1.1 "><p id="mrs_01_1408__p494934210019">Array<data_type></p>
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</td>
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<td class="cellrowborder" rowspan="3" valign="top" width="69.36%" headers="mcps1.3.2.5.2.3.1.2 "><p id="mrs_01_1408__p1395024220011">N/A</p>
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<div class="note" id="mrs_01_1408__note562206151116"><span class="notetitle"> NOTE: </span><div class="notebody"><p id="mrs_01_1408__p11622613114">Currently, only two layers of complex types can be nested.</p>
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</div></div>
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</td>
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</tr>
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<tr id="mrs_01_1408__row33811251356"><td class="cellrowborder" valign="top" headers="mcps1.3.2.5.2.3.1.1 "><p id="mrs_01_1408__p838212251154">Struct<col_name: data_type COMMENT col_comment, ...></p>
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</td>
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</tr>
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<tr id="mrs_01_1408__row12625720151018"><td class="cellrowborder" valign="top" headers="mcps1.3.2.5.2.3.1.1 "><p id="mrs_01_1408__p0625162091013">Map<primitive_type, data_type></p>
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</td>
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</tr>
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</tbody>
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</table>
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</div>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="mrs_01_1407.html">CarbonData Table Management</a></div>
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</div>
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</div>
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