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ddm_umn_20240202

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Reviewed-by: Wagner, Fabian <fabian.wagner@t-systems.com>
Co-authored-by: Ru, Li Yi <liyiru7@huawei.com>
Co-committed-by: Ru, Li Yi <liyiru7@huawei.com>
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Ru, Li Yi 2024-02-07 12:13:28 +00:00 committed by zuul
parent 2bc9b1ec8c
commit f6131bf1e8
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docs/ddm/umn/ddm-08-0006.html
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@ -52,7 +52,7 @@ select_expr
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<div class="section" id="ddm-08-0006__section1019017511569"><h4 class="sectiontitle">Syntax Description</h4><ul id="ddm-08-0006__ul196911227588"><li id="ddm-08-0006__li410762215381">An empty string cannot be used as an alias.</li><li id="ddm-08-0006__li136814241582">SELECT ... GROUP BY ... WITH ROLLUP is not supported.</li><li id="ddm-08-0006__li20108022143817">Neither STRAIGHT_JOIN nor NATURAL JOIN is supported.</li><li id="ddm-08-0006__li5838144812385">The SELECT FOR UPDATE statement supports only simple queries and does not support JOIN, GROUP BY, ORDER BY, or LIMIT.</li><li id="ddm-08-0006__li141099222388">Each SELECT statement in UNION does not support multiple columns with the same name, for example,<p id="ddm-08-0006__p1161535214386"><a name="ddm-08-0006__li141099222388"></a><a name="li141099222388"></a>SELECT id, id, name FROM t1 UNION SELECT pk, pk, name FROM t2 is not supported because this statement has duplicate column names.</p>
<div class="section" id="ddm-08-0006__section1019017511569"><h4 class="sectiontitle">Syntax Description</h4><ul id="ddm-08-0006__ul196911227588"><li id="ddm-08-0006__li410762215381">An empty string cannot be used as an alias.</li><li id="ddm-08-0006__li136814241582">The SELECT... GROUP BY... WITH ROLLUP QUERY statement is not supported. (When the queried table is a sharded table, you cannot obtain the expected result)</li><li id="ddm-08-0006__li20108022143817">Neither STRAIGHT_JOIN nor NATURAL JOIN is supported.</li><li id="ddm-08-0006__li5838144812385">The SELECT FOR UPDATE statement supports only simple queries and does not support JOIN, GROUP BY, ORDER BY, or LIMIT.</li><li id="ddm-08-0006__li141099222388">Each SELECT statement in UNION does not support multiple columns with the same name, for example,<p id="ddm-08-0006__p1161535214386"><a name="ddm-08-0006__li141099222388"></a><a name="li141099222388"></a>SELECT id, id, name FROM t1 UNION SELECT pk, pk, name FROM t2 is not supported because this statement has duplicate column names.</p>
</li><li id="ddm-08-0006__li654214302312">User-defined sequencing similar to <strong id="ddm-08-0006__b885789193917">ORDER BY FIELD(id,1,2,3)</strong> is not supported.</li></ul>
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