-
Notifications
You must be signed in to change notification settings - Fork 16
/
Copy pathtypes.html
310 lines (297 loc) · 16.9 KB
/
types.html
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>7.1. Data Types — Presto 0.204 Documentation</title>
<link rel="stylesheet" href="../_static/presto.css" type="text/css" />
<link rel="stylesheet" href="../_static/pygments.css" type="text/css" />
<script type="text/javascript">
var DOCUMENTATION_OPTIONS = {
URL_ROOT: '../',
VERSION: '0.204',
COLLAPSE_INDEX: false,
FILE_SUFFIX: '.html',
HAS_SOURCE: true
};
</script>
<script type="text/javascript" src="../_static/jquery.js"></script>
<script type="text/javascript" src="../_static/underscore.js"></script>
<script type="text/javascript" src="../_static/doctools.js"></script>
<link rel="index" title="Index" href="../genindex.html" />
<link rel="search" title="Search" href="../search.html" />
<link rel="top" title="Presto 0.204 Documentation" href="../index.html" />
<link rel="up" title="7. SQL Language" href="../language.html" />
<link rel="next" title="7.2. Reserved Keywords" href="reserved.html" />
<link rel="prev" title="7. SQL Language" href="../language.html" />
</head>
<body role="document">
<div class="header">
<h1 class="heading"><a href="../index.html">
<span>Presto 0.204 Documentation</span></a></h1>
<h2 class="heading"><span>7.1. Data Types</span></h2>
</div>
<div class="topnav">
<p class="nav">
<span class="left">
« <a href="../language.html">7. SQL Language</a>
</span>
<span class="right">
<a href="reserved.html">7.2. Reserved Keywords</a> »
</span>
</p>
</div>
<div class="content">
<div class="section" id="data-types">
<h1>7.1. Data Types</h1>
<p>Presto has a set of built-in data types, described below.
Additional types can be provided by plugins.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">Connectors are not required to support all types.
See connector documentation for details on supported types.</p>
</div>
<div class="contents local topic" id="contents">
<ul class="simple">
<li><a class="reference internal" href="#boolean" id="id3">Boolean</a></li>
<li><a class="reference internal" href="#integer" id="id4">Integer</a></li>
<li><a class="reference internal" href="#floating-point" id="id5">Floating-Point</a></li>
<li><a class="reference internal" href="#fixed-precision" id="id6">Fixed-Precision</a></li>
<li><a class="reference internal" href="#string" id="id7">String</a></li>
<li><a class="reference internal" href="#date-and-time" id="id8">Date and Time</a></li>
<li><a class="reference internal" href="#structural" id="id9">Structural</a></li>
<li><a class="reference internal" href="#network-address" id="id10">Network Address</a></li>
</ul>
</div>
<div class="section" id="boolean">
<h2>Boolean</h2>
<div class="section" id="id1">
<h3><code class="docutils literal"><span class="pre">BOOLEAN</span></code></h3>
<blockquote>
<div>This type captures boolean values <code class="docutils literal"><span class="pre">true</span></code> and <code class="docutils literal"><span class="pre">false</span></code>.</div></blockquote>
</div>
</div>
<div class="section" id="integer">
<h2>Integer</h2>
<div class="section" id="tinyint">
<h3><code class="docutils literal"><span class="pre">TINYINT</span></code></h3>
<blockquote>
<div>A 8-bit signed two’s complement integer with a minimum value of
<code class="docutils literal"><span class="pre">-2^7</span></code> and a maximum value of <code class="docutils literal"><span class="pre">2^7</span> <span class="pre">-</span> <span class="pre">1</span></code>.</div></blockquote>
</div>
<div class="section" id="smallint">
<h3><code class="docutils literal"><span class="pre">SMALLINT</span></code></h3>
<blockquote>
<div>A 16-bit signed two’s complement integer with a minimum value of
<code class="docutils literal"><span class="pre">-2^15</span></code> and a maximum value of <code class="docutils literal"><span class="pre">2^15</span> <span class="pre">-</span> <span class="pre">1</span></code>.</div></blockquote>
</div>
<div class="section" id="id2">
<h3><code class="docutils literal"><span class="pre">INTEGER</span></code></h3>
<blockquote>
<div>A 32-bit signed two’s complement integer with a minimum value of
<code class="docutils literal"><span class="pre">-2^31</span></code> and a maximum value of <code class="docutils literal"><span class="pre">2^31</span> <span class="pre">-</span> <span class="pre">1</span></code>. The name <code class="docutils literal"><span class="pre">INT</span></code> is
also available for this type.</div></blockquote>
</div>
<div class="section" id="bigint">
<h3><code class="docutils literal"><span class="pre">BIGINT</span></code></h3>
<blockquote>
<div>A 64-bit signed two’s complement integer with a minimum value of
<code class="docutils literal"><span class="pre">-2^63</span></code> and a maximum value of <code class="docutils literal"><span class="pre">2^63</span> <span class="pre">-</span> <span class="pre">1</span></code>.</div></blockquote>
</div>
</div>
<div class="section" id="floating-point">
<h2>Floating-Point</h2>
<div class="section" id="real">
<h3><code class="docutils literal"><span class="pre">REAL</span></code></h3>
<blockquote>
<div>A real is a 32-bit inexact, variable-precision implementing the
IEEE Standard 754 for Binary Floating-Point Arithmetic.</div></blockquote>
</div>
<div class="section" id="double">
<h3><code class="docutils literal"><span class="pre">DOUBLE</span></code></h3>
<blockquote>
<div>A double is a 64-bit inexact, variable-precision implementing the
IEEE Standard 754 for Binary Floating-Point Arithmetic.</div></blockquote>
</div>
</div>
<div class="section" id="fixed-precision">
<h2>Fixed-Precision</h2>
<div class="section" id="decimal">
<h3><code class="docutils literal"><span class="pre">DECIMAL</span></code></h3>
<blockquote>
<div><p>A fixed precision decimal number. Precision up to 38 digits is supported
but performance is best up to 18 digits.</p>
<p>The decimal type takes two literal parameters:</p>
<blockquote>
<div><ul class="simple">
<li><strong>precision</strong> - total number of digits</li>
<li><strong>scale</strong> - number of digits in fractional part. Scale is optional and defaults to 0.</li>
</ul>
</div></blockquote>
<p>Example type definitions: <code class="docutils literal"><span class="pre">DECIMAL(10,3)</span></code>, <code class="docutils literal"><span class="pre">DECIMAL(20)</span></code></p>
<p>Example literals: <code class="docutils literal"><span class="pre">DECIMAL</span> <span class="pre">'10.3'</span></code>, <code class="docutils literal"><span class="pre">DECIMAL</span> <span class="pre">'1234567890'</span></code>, <code class="docutils literal"><span class="pre">1.1</span></code></p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p>For compatibility reasons decimal literals without explicit type specifier (e.g. <code class="docutils literal"><span class="pre">1.2</span></code>)
are treated as the values of the <code class="docutils literal"><span class="pre">DOUBLE</span></code> type by default, but this is subject to change
in future releases. This behavior is controlled by:</p>
<blockquote class="last">
<div><ul class="simple">
<li>System wide property: <code class="docutils literal"><span class="pre">parse-decimal-literals-as-double</span></code></li>
<li>Session wide property: <code class="docutils literal"><span class="pre">parse_decimal_literals_as_double</span></code></li>
</ul>
</div></blockquote>
</div>
</div></blockquote>
</div>
</div>
<div class="section" id="string">
<h2>String</h2>
<div class="section" id="varchar">
<h3><code class="docutils literal"><span class="pre">VARCHAR</span></code></h3>
<blockquote>
<div><p>Variable length character data with an optional maximum length.</p>
<p>Example type definitions: <code class="docutils literal"><span class="pre">varchar</span></code>, <code class="docutils literal"><span class="pre">varchar(20)</span></code></p>
</div></blockquote>
</div>
<div class="section" id="char">
<h3><code class="docutils literal"><span class="pre">CHAR</span></code></h3>
<blockquote>
<div><p>Fixed length character data. A <code class="docutils literal"><span class="pre">CHAR</span></code> type without length specified has a default length of 1.
A <code class="docutils literal"><span class="pre">CHAR(x)</span></code> value always has <code class="docutils literal"><span class="pre">x</span></code> characters. For instance, casting <code class="docutils literal"><span class="pre">dog</span></code> to <code class="docutils literal"><span class="pre">CHAR(7)</span></code>
adds 4 implicit trailing spaces. Leading and trailing spaces are included in comparisons of
<code class="docutils literal"><span class="pre">CHAR</span></code> values. As a result, two character values with different lengths (<code class="docutils literal"><span class="pre">CHAR(x)</span></code> and
<code class="docutils literal"><span class="pre">CHAR(y)</span></code> where <code class="docutils literal"><span class="pre">x</span> <span class="pre">!=</span> <span class="pre">y</span></code>) will never be equal.</p>
<p>Example type definitions: <code class="docutils literal"><span class="pre">char</span></code>, <code class="docutils literal"><span class="pre">char(20)</span></code></p>
</div></blockquote>
</div>
<div class="section" id="varbinary">
<h3><code class="docutils literal"><span class="pre">VARBINARY</span></code></h3>
<blockquote>
<div><p>Variable length binary data.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">Binary strings with length are not yet supported: <code class="docutils literal"><span class="pre">varbinary(n)</span></code></p>
</div>
</div></blockquote>
</div>
<div class="section" id="json">
<h3><code class="docutils literal"><span class="pre">JSON</span></code></h3>
<blockquote>
<div>JSON value type, which can be a JSON object, a JSON array, a JSON number, a JSON string,
<code class="docutils literal"><span class="pre">true</span></code>, <code class="docutils literal"><span class="pre">false</span></code> or <code class="docutils literal"><span class="pre">null</span></code>.</div></blockquote>
</div>
</div>
<div class="section" id="date-and-time">
<h2>Date and Time</h2>
<div class="section" id="date">
<h3><code class="docutils literal"><span class="pre">DATE</span></code></h3>
<blockquote>
<div><p>Calendar date (year, month, day).</p>
<p>Example: <code class="docutils literal"><span class="pre">DATE</span> <span class="pre">'2001-08-22'</span></code></p>
</div></blockquote>
</div>
<div class="section" id="time">
<h3><code class="docutils literal"><span class="pre">TIME</span></code></h3>
<blockquote>
<div><p>Time of day (hour, minute, second, millisecond) without a time zone.
Values of this type are parsed and rendered in the session time zone.</p>
<p>Example: <code class="docutils literal"><span class="pre">TIME</span> <span class="pre">'01:02:03.456'</span></code></p>
</div></blockquote>
</div>
<div class="section" id="time-with-time-zone">
<h3><code class="docutils literal"><span class="pre">TIME</span> <span class="pre">WITH</span> <span class="pre">TIME</span> <span class="pre">ZONE</span></code></h3>
<blockquote>
<div><p>Time of day (hour, minute, second, millisecond) with a time zone.
Values of this type are rendered using the time zone from the value.</p>
<p>Example: <code class="docutils literal"><span class="pre">TIME</span> <span class="pre">'01:02:03.456</span> <span class="pre">America/Los_Angeles'</span></code></p>
</div></blockquote>
</div>
<div class="section" id="timestamp">
<h3><code class="docutils literal"><span class="pre">TIMESTAMP</span></code></h3>
<blockquote>
<div><p>Instant in time that includes the date and time of day without a time zone.
Values of this type are parsed and rendered in the session time zone.</p>
<p>Example: <code class="docutils literal"><span class="pre">TIMESTAMP</span> <span class="pre">'2001-08-22</span> <span class="pre">03:04:05.321'</span></code></p>
</div></blockquote>
</div>
<div class="section" id="timestamp-with-time-zone">
<h3><code class="docutils literal"><span class="pre">TIMESTAMP</span> <span class="pre">WITH</span> <span class="pre">TIME</span> <span class="pre">ZONE</span></code></h3>
<blockquote>
<div><p>Instant in time that includes the date and time of day with a time zone.
Values of this type are rendered using the time zone from the value.</p>
<p>Example: <code class="docutils literal"><span class="pre">TIMESTAMP</span> <span class="pre">'2001-08-22</span> <span class="pre">03:04:05.321</span> <span class="pre">America/Los_Angeles'</span></code></p>
</div></blockquote>
</div>
<div class="section" id="interval-year-to-month">
<h3><code class="docutils literal"><span class="pre">INTERVAL</span> <span class="pre">YEAR</span> <span class="pre">TO</span> <span class="pre">MONTH</span></code></h3>
<blockquote>
<div><p>Span of years and months.</p>
<p>Example: <code class="docutils literal"><span class="pre">INTERVAL</span> <span class="pre">'3'</span> <span class="pre">MONTH</span></code></p>
</div></blockquote>
</div>
<div class="section" id="interval-day-to-second">
<h3><code class="docutils literal"><span class="pre">INTERVAL</span> <span class="pre">DAY</span> <span class="pre">TO</span> <span class="pre">SECOND</span></code></h3>
<blockquote>
<div><p>Span of days, hours, minutes, seconds and milliseconds.</p>
<p>Example: <code class="docutils literal"><span class="pre">INTERVAL</span> <span class="pre">'2'</span> <span class="pre">DAY</span></code></p>
</div></blockquote>
</div>
</div>
<div class="section" id="structural">
<h2>Structural</h2>
<div class="section" id="array">
<span id="array-type"></span><h3><code class="docutils literal"><span class="pre">ARRAY</span></code></h3>
<blockquote>
<div><p>An array of the given component type.</p>
<p>Example: <code class="docutils literal"><span class="pre">ARRAY[1,</span> <span class="pre">2,</span> <span class="pre">3]</span></code></p>
</div></blockquote>
</div>
<div class="section" id="map">
<span id="map-type"></span><h3><code class="docutils literal"><span class="pre">MAP</span></code></h3>
<blockquote>
<div><p>A map between the given component types.</p>
<p>Example: <code class="docutils literal"><span class="pre">MAP(ARRAY['foo',</span> <span class="pre">'bar'],</span> <span class="pre">ARRAY[1,</span> <span class="pre">2])</span></code></p>
</div></blockquote>
</div>
<div class="section" id="row">
<span id="row-type"></span><h3><code class="docutils literal"><span class="pre">ROW</span></code></h3>
<blockquote>
<div><p>A structure made up of named fields. The fields may be of any SQL type, and are
accessed with field reference operator <code class="docutils literal"><span class="pre">.</span></code></p>
<p>Example: <code class="docutils literal"><span class="pre">CAST(ROW(1,</span> <span class="pre">2.0)</span> <span class="pre">AS</span> <span class="pre">ROW(x</span> <span class="pre">BIGINT,</span> <span class="pre">y</span> <span class="pre">DOUBLE))</span></code></p>
</div></blockquote>
</div>
</div>
<div class="section" id="network-address">
<h2>Network Address</h2>
<div class="section" id="ipaddress">
<span id="ipaddress-type"></span><h3><code class="docutils literal"><span class="pre">IPADDRESS</span></code></h3>
<blockquote>
<div><p>An IP address that can represent either an IPv4 or IPv6 address. Internally,
the type is a pure IPv6 address. Support for IPv4 is handled using the
<em>IPv4-mapped IPv6 address</em> range (<span class="target" id="index-0"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc4291.html#section-2.5.5.2"><strong>RFC 4291#section-2.5.5.2</strong></a>).
When creating an <code class="docutils literal"><span class="pre">IPADDRESS</span></code>, IPv4 addresses will be mapped into that range.
When formatting an <code class="docutils literal"><span class="pre">IPADDRESS</span></code>, any address within the mapped range will
be formatted as an IPv4 address. Other addresses will be formatted as IPv6
using the canonical format defined in <span class="target" id="index-1"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc5952.html"><strong>RFC 5952</strong></a>.</p>
<p>Examples: <code class="docutils literal"><span class="pre">IPADDRESS</span> <span class="pre">'10.0.0.1'</span></code>, <code class="docutils literal"><span class="pre">IPADDRESS</span> <span class="pre">'2001:db8::1'</span></code></p>
</div></blockquote>
</div>
</div>
</div>
</div>
<div class="bottomnav">
<p class="nav">
<span class="left">
« <a href="../language.html">7. SQL Language</a>
</span>
<span class="right">
<a href="reserved.html">7.2. Reserved Keywords</a> »
</span>
</p>
</div>
<div class="footer" role="contentinfo">
</div>
</body>
</html>