blocks|key|365870|text|完整的语法取决于您正在使用的数据库引擎：|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|365871|对于SQL+Server：|365872|CASE+case-expression
++++WHEN+when-expression-1+THEN+value-1
++[+WHEN+when-expression-n+THEN+value-n+...+]
++[+ELSE+else-value+]
END|code-block|syntax|javascript|365873|或者：|365874|CASE
++++WHEN+boolean-when-expression-1+THEN+value-1
++[+WHEN+boolean-when-expression-n+THEN+value-n+...+]
++[+ELSE+else-value+]
END|365875|表达式等：|365876|case-expression++++-+something+that+produces+a+value
when-expression-x++-+something+that+is+compared+against+the+case-expression
value-1++++++++++++-+the+result+of+the+CASE+statement+if:
+++++++++++++++++++++++++the+when-expression+==+case-expression
++++++++++++++++++++++OR+the+boolean-when-expression+==+TRUE
boolean-when-exp..+-+something+that+produces+a+TRUE/FALSE+answer|365877|链接：CASE+(Transact-SQL)|365878|还要注意的是，WHEN语句的顺序很重要。您可以很容易地编写多个重叠的WHEN子句，第一个匹配的子句就是。|365879|注意:如果没有指定ELSE子句，并且没有找到匹配的WHEN-，则CASE表达式的值将为NULL。|365880|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/ms181765.aspx^0|0|3|0|0|0|0|0|0|0|3|J|0|0|0|0|U|0^^$0|@$1|2|3|4|5|6|7|18|8|@$9|19|A|1A|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|1B|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|1C|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|1D|8|@]|D|@]|E|$]]|$1|O|3|P|5|J|7|1E|8|@]|D|@]|E|$K|L]]|$1|Q|3|R|5|6|7|1F|8|@]|D|@]|E|$]]|$1|S|3|T|5|J|7|1G|8|@]|D|@]|E|$K|L]]|$1|U|3|V|5|6|7|1H|8|@]|D|@$9|1I|A|1J|1|1K]]|E|$]]|$1|W|3|X|5|6|7|1L|8|@]|D|@]|E|$]]|$1|Y|3|Z|5|6|7|1M|8|@$9|1N|A|1O|B|C]]|D|@]|E|$]]|$1|10|3|-4|5|6|7|1P|8|@]|D|@]|E|$]]]|11|$12|$5|13|14|15|E|$16|17]]]]

<p>The <strong>complete</strong> syntax depends on the database engine you're working with:</p>

<p>For SQL Server:</p>

<pre><code>CASE case-expression
    WHEN when-expression-1 THEN value-1
  [ WHEN when-expression-n THEN value-n ... ]
  [ ELSE else-value ]
END
</code></pre>

<p>or:</p>

<pre><code>CASE
    WHEN boolean-when-expression-1 THEN value-1
  [ WHEN boolean-when-expression-n THEN value-n ... ]
  [ ELSE else-value ]
END
</code></pre>

<p>expressions, etc:</p>

<pre><code>case-expression    - something that produces a value
when-expression-x  - something that is compared against the case-expression
value-1            - the result of the CASE statement if:
                         the when-expression == case-expression
                      OR the boolean-when-expression == TRUE
boolean-when-exp.. - something that produces a TRUE/FALSE answer
</code></pre>

<p>Link: <a href="http://msdn.microsoft.com/en-us/library/ms181765.aspx" rel="noreferrer">CASE (Transact-SQL)</a></p>

<p>Also note that the ordering of the WHEN statements is important. You can easily write multiple WHEN clauses that overlap, and <strong>the first one that matches is used</strong>.</p>

<p><strong>Note</strong>: If no ELSE clause is specified, and no matching WHEN-condition is found, the value of the CASE expression will be <em>NULL</em>.</p>


blocks|key|370698|text|我在Oracle页面上找到了同样的语法，看起来语法相同，只是描述略有不同。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|370699|链接：Oracle/PLSQL:+Case+Statement|offset|length|370700|entityMap|0|LINK|mutability|MUTABLE|url|http://www.techonthenet.com/oracle/functions/case.php^0|0|3|S|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

<p>I dug up the Oracle page for the same and it looks like this is the same syntax, just described slightly different.</p>

<p>Link: <a href="http://www.techonthenet.com/oracle/functions/case.php" rel="nofollow noreferrer">Oracle/PLSQL: Case Statement</a></p>


blocks|key|370707|text|下面是CASE+statement+examples+from+the+PostgreSQL+docs+(Postgres在这里遵循SQL标准)：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|370708|SELECT+a,
+++CASE+WHEN+a=1+THEN+'one'
++++++++WHEN+a=2+THEN+'two'
++++++++ELSE+'other'
+++END
FROM+test;|code-block|syntax|javascript|370709|或|370710|SELECT+a,
+++CASE+a+WHEN+1+THEN+'one'
++++++++++WHEN+2+THEN+'two'
++++++++++ELSE+'other'
+++END
FROM+test;|370711|显然，当您仅根据一系列可能的值检查一个字段时，第二个表单更简洁。第一种形式允许更复杂的表达式。|370712|entityMap|0|LINK|mutability|MUTABLE|url|http://www.postgresql.org/docs/current/static/functions-conditional.html^0|3|4|3|1C|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@$9|Z|A|10|B|C]]|D|@$9|11|A|12|1|13]]|E|$]]|$1|F|3|G|5|H|7|14|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|15|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|16|8|@]|D|@]|E|$I|J]]|$1|O|3|P|5|6|7|17|8|@]|D|@]|E|$]]|$1|Q|3|-4|5|6|7|18|8|@]|D|@]|E|$]]]|R|$S|$5|T|U|V|E|$W|X]]]]

<p>Here are the <a href="http://www.postgresql.org/docs/current/static/functions-conditional.html" rel="noreferrer" title="Conditional Expressions"><code>CASE</code> statement examples from the PostgreSQL docs</a> (Postgres follows the SQL standard here):</p>

<pre><code>SELECT a,
   CASE WHEN a=1 THEN 'one'
        WHEN a=2 THEN 'two'
        ELSE 'other'
   END
FROM test;
</code></pre>

<p>or</p>

<pre><code>SELECT a,
   CASE a WHEN 1 THEN 'one'
          WHEN 2 THEN 'two'
          ELSE 'other'
   END
FROM test;
</code></pre>

<p>Obviously the second form is cleaner when you are just checking one field against a list of possible values. The first form allows more complicated expressions.</p>


blocks|key|3163913|text|考虑到您标记了多个产品，我认为完整的正确语法应该是ISO/ANSI+SQL-92标准中的语法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3163914|<case+expression>+::=
+++++++<case+abbreviation>
+++++%7C+<case+specification>

<case+abbreviation>+::=
+++++++NULLIF+<left+paren>+<value+expression>+<comma>
++++++++++++++<value+expression>+<right+paren>
+++++%7C+COALESCE+<left+paren>+<value+expression>
++++++++++++++++{+<comma>+<value+expression>+}...+<right+paren>

<case+specification>+::=
+++++++<simple+case>
+++++%7C+<searched+case>

<simple+case>+::=
+++++CASE+<case+operand>
++++++++++<simple+when+clause>...
++++++++[+<else+clause>+]
+++++END

<searched+case>+::=
+++++CASE
+++++++<searched+when+clause>...
+++++[+<else+clause>+]
+++++END

<simple+when+clause>+::=+WHEN+<when+operand>+THEN+<result>

<searched+when+clause>+::=+WHEN+<search+condition>+THEN+<result>

<else+clause>+::=+ELSE+<result>

<case+operand>+::=+<value+expression>

<when+operand>+::=+<value+expression>

<result>+::=+<result+expression>+%7C+NULL

<result+expression>+::=+<value+expression>|code-block|syntax|javascript|3163915|语法规则|3163916|1)+NULLIF+(V1,+V2)+is+equivalent+to+the+following+<case+specification>:

+++++CASE+WHEN+V1=V2+THEN+NULL+ELSE+V1+END

2)+COALESCE+(V1,+V2)+is+equivalent+to+the+following+<case+specification>:

+++++CASE+WHEN+V1+IS+NOT+NULL+THEN+V1+ELSE+V2+END

3)+COALESCE+(V1,+V2,+.+.+.+,n+),+for+n+>=+3,+is+equivalent+to+the
+++following+<case+specification>:

+++++CASE+WHEN+V1+IS+NOT+NULL+THEN+V1+ELSE+COALESCE+(V2,+.+.+.+,n+)
+++++END

4)+If+a+<case+specification>+specifies+a+<simple+case>,+then+let+CO
+++be+the+<case+operand>:

+++a)+The+data+type+of+each+<when+operand>+WO+shall+be+comparable
++++++with+the+data+type+of+the+<case+operand>.

+++b)+The+<case+specification>+is+equivalent+to+a+<searched+case>
++++++in+which+each+<searched+when+clause>+specifies+a+<search
++++++condition>+of+the+form+"CO=WO".

5)+At+least+one+<result>+in+a+<case+specification>+shall+specify+a
+++<result+expression>.

6)+If+an+<else+clause>+is+not+specified,+then+ELSE+NULL+is+im-
+++plicit.

7)+The+data+type+of+a+<case+specification>+is+determined+by+ap-
+++plying+Subclause+9.3,+"Set+operation+result+data+types",+to+the
+++data+types+of+all+<result+expression>s+in+the+<case+specifica-
+++tion>.

Access+Rules

+++None.

General+Rules

1)+Case:

+++a)+If+a+<result>+specifies+NULL,+then+its+value+is+the+null
++++++value.

+++b)+If+a+<result>+specifies+a+<value+expression>,+then+its+value
++++++is+the+value+of+that+<value+expression>.

2)+Case:

+++a)+If+the+<search+condition>+of+some+<searched+when+clause>+in
++++++a+<case+specification>+is+true,+then+the+value+of+the+<case
++++++specification>+is+the+value+of+the+<result>+of+the+first
++++++(leftmost)+<searched+when+clause>+whose+<search+condition>+is
++++++true,+cast+as+the+data+type+of+the+<case+specification>.

+++b)+If+no+<search+condition>+in+a+<case+specification>+is+true,
++++++then+the+value+of+the+<case+expression>+is+the+value+of+the
++++++<result>+of+the+explicit+or+implicit+<else+clause>,+cast+as
++++++the+data+type+of+the+<case+specification>.|3163917|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

<p>Considering you tagged multiple products, I'd say the <em>full</em> correct syntax would be the one found in the ISO/ANSI SQL-92 standard:</p>

<pre><code>&lt;case expression&gt; ::=
       &lt;case abbreviation&gt;
     | &lt;case specification&gt;

&lt;case abbreviation&gt; ::=
       NULLIF &lt;left paren&gt; &lt;value expression&gt; &lt;comma&gt;
              &lt;value expression&gt; &lt;right paren&gt;
     | COALESCE &lt;left paren&gt; &lt;value expression&gt;
                { &lt;comma&gt; &lt;value expression&gt; }... &lt;right paren&gt;

&lt;case specification&gt; ::=
       &lt;simple case&gt;
     | &lt;searched case&gt;

&lt;simple case&gt; ::=
     CASE &lt;case operand&gt;
          &lt;simple when clause&gt;...
        [ &lt;else clause&gt; ]
     END

&lt;searched case&gt; ::=
     CASE
       &lt;searched when clause&gt;...
     [ &lt;else clause&gt; ]
     END

&lt;simple when clause&gt; ::= WHEN &lt;when operand&gt; THEN &lt;result&gt;

&lt;searched when clause&gt; ::= WHEN &lt;search condition&gt; THEN &lt;result&gt;

&lt;else clause&gt; ::= ELSE &lt;result&gt;

&lt;case operand&gt; ::= &lt;value expression&gt;

&lt;when operand&gt; ::= &lt;value expression&gt;

&lt;result&gt; ::= &lt;result expression&gt; | NULL

&lt;result expression&gt; ::= &lt;value expression&gt;
</code></pre>

<p>Syntax Rules</p>

<pre><code>1) NULLIF (V1, V2) is equivalent to the following &lt;case specification&gt;:

     CASE WHEN V1=V2 THEN NULL ELSE V1 END

2) COALESCE (V1, V2) is equivalent to the following &lt;case specification&gt;:

     CASE WHEN V1 IS NOT NULL THEN V1 ELSE V2 END

3) COALESCE (V1, V2, . . . ,n ), for n &gt;= 3, is equivalent to the
   following &lt;case specification&gt;:

     CASE WHEN V1 IS NOT NULL THEN V1 ELSE COALESCE (V2, . . . ,n )
     END

4) If a &lt;case specification&gt; specifies a &lt;simple case&gt;, then let CO
   be the &lt;case operand&gt;:

   a) The data type of each &lt;when operand&gt; WO shall be comparable
      with the data type of the &lt;case operand&gt;.

   b) The &lt;case specification&gt; is equivalent to a &lt;searched case&gt;
      in which each &lt;searched when clause&gt; specifies a &lt;search
      condition&gt; of the form "CO=WO".

5) At least one &lt;result&gt; in a &lt;case specification&gt; shall specify a
   &lt;result expression&gt;.

6) If an &lt;else clause&gt; is not specified, then ELSE NULL is im-
   plicit.

7) The data type of a &lt;case specification&gt; is determined by ap-
   plying Subclause 9.3, "Set operation result data types", to the
   data types of all &lt;result expression&gt;s in the &lt;case specifica-
   tion&gt;.

Access Rules

   None.

General Rules

1) Case:

   a) If a &lt;result&gt; specifies NULL, then its value is the null
      value.

   b) If a &lt;result&gt; specifies a &lt;value expression&gt;, then its value
      is the value of that &lt;value expression&gt;.

2) Case:

   a) If the &lt;search condition&gt; of some &lt;searched when clause&gt; in
      a &lt;case specification&gt; is true, then the value of the &lt;case
      specification&gt; is the value of the &lt;result&gt; of the first
      (leftmost) &lt;searched when clause&gt; whose &lt;search condition&gt; is
      true, cast as the data type of the &lt;case specification&gt;.

   b) If no &lt;search condition&gt; in a &lt;case specification&gt; is true,
      then the value of the &lt;case expression&gt; is the value of the
      &lt;result&gt; of the explicit or implicit &lt;else clause&gt;, cast as
      the data type of the &lt;case specification&gt;.
</code></pre>


blocks|key|3163950|text|Sybase与SQL+Server具有相同的case+syntax：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3163951|描述|3163952|支持条件SQL表达式；可以在任何可以使用值表达式的地方使用。|3163953|语法|3163954|case+
+++++when+search_condition+then+expression+
++++[when+search_condition+then+expression]...
++++[else+expression]
end|code-block|syntax|javascript|3163955|大小写和值语法|3163956|case+expression
+++++when+expression+then+expression+
++++[when+expression+then+expression]...
++++[else+expression]
end|3163957|参数|3163958|案例|3163959|开始case表达式。|3163960|什么时候|3163961|位于要比较的搜索条件或表达式之前。|3163962|search_condition|3163963|用于为选定的结果设置条件。case表达式的搜索条件类似于where子句中的搜索条件。《Transact-SQL用户指南》中详细介绍了搜索条件。|3163964|然后|3163965|位于指定结果值case的表达式之前。|3163966|表达式|3163967|列名、常量、函数、子查询，或者由算术或按位运算符连接的列名、常量和函数的任意组合。有关表达式的详细信息，请参阅中的“表达式”。|3163968|示例|3163969|select+disaster,+
+++++++case
++++++++++++when+disaster+=+"earthquake"+
++++++++++++++++then+"stand+in+doorway"
++++++++++++when+disaster+=+"nuclear+apocalypse"+
++++++++++++++++then+"hide+in+basement"
++++++++++++when+monster+=+"zombie+apocalypse"+
++++++++++++++++then+"hide+with+Chuck+Norris"
++++++++++++else
++++++++++++++++then+"ask+mom"
+++++++end+
++from+endoftheworld|3163970|entityMap|0|LINK|mutability|MUTABLE|url|http://infocenter.sybase.com/help/index.jsp?topic=/com.sybase.help.ase_15.0.blocks/html/blocks/blocks115.htm^0|M|B|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1Q|8|@]|9|@$A|1R|B|1S|1|1T]]|C|$]]|$1|D|3|E|5|6|7|1U|8|@]|9|@]|C|$]]|$1|F|3|G|5|6|7|1V|8|@]|9|@]|C|$]]|$1|H|3|I|5|6|7|1W|8|@]|9|@]|C|$]]|$1|J|3|K|5|L|7|1X|8|@]|9|@]|C|$M|N]]|$1|O|3|P|5|6|7|1Y|8|@]|9|@]|C|$]]|$1|Q|3|R|5|L|7|1Z|8|@]|9|@]|C|$M|N]]|$1|S|3|T|5|6|7|20|8|@]|9|@]|C|$]]|$1|U|3|V|5|6|7|21|8|@]|9|@]|C|$]]|$1|W|3|X|5|6|7|22|8|@]|9|@]|C|$]]|$1|Y|3|Z|5|6|7|23|8|@]|9|@]|C|$]]|$1|10|3|11|5|6|7|24|8|@]|9|@]|C|$]]|$1|12|3|13|5|6|7|25|8|@]|9|@]|C|$]]|$1|14|3|15|5|6|7|26|8|@]|9|@]|C|$]]|$1|16|3|17|5|6|7|27|8|@]|9|@]|C|$]]|$1|18|3|19|5|6|7|28|8|@]|9|@]|C|$]]|$1|1A|3|1B|5|6|7|29|8|@]|9|@]|C|$]]|$1|1C|3|1D|5|6|7|2A|8|@]|9|@]|C|$]]|$1|1E|3|1F|5|6|7|2B|8|@]|9|@]|C|$]]|$1|1G|3|1H|5|L|7|2C|8|@]|9|@]|C|$M|N]]|$1|1I|3|-4|5|6|7|2D|8|@]|9|@]|C|$]]]|1J|$1K|$5|1L|1M|1N|C|$1O|1P]]]]

<p>Sybase has the same <a href="http://infocenter.sybase.com/help/index.jsp?topic=/com.sybase.help.ase_15.0.blocks/html/blocks/blocks115.htm" rel="noreferrer">case syntax</a> as SQL Server:</p>

<h2>Description</h2>

<p>Supports conditional SQL expressions; can be used anywhere a value expression can be used.</p>

<h3>Syntax</h3>

<pre><code>case 
     when search_condition then expression 
    [when search_condition then expression]...
    [else expression]
end
</code></pre>

<h3>Case and values syntax</h3>

<pre><code>case expression
     when expression then expression 
    [when expression then expression]...
    [else expression]
end
</code></pre>

<h2>Parameters</h2>

<h3>case</h3>

<p>begins the case expression.</p>

<h3>when</h3>

<p>precedes the search condition or the expression to be compared.</p>

<h3>search_condition</h3>

<p>is used to set conditions for the results that are selected. Search conditions for case expressions are similar to the search conditions in a where clause. Search conditions are detailed in the Transact-SQL User’s Guide.</p>

<h3>then</h3>

<p>precedes the expression that specifies a result value of case.</p>

<h3>expression</h3>

<p>is a column name, a constant, a function, a subquery, or any combination of column names, constants, and functions connected by arithmetic or bitwise operators. For more information about expressions, see “Expressions” in.</p>

<h2>Example</h2>

<pre><code>select disaster, 
       case
            when disaster = "earthquake" 
                then "stand in doorway"
            when disaster = "nuclear apocalypse" 
                then "hide in basement"
            when monster = "zombie apocalypse" 
                then "hide with Chuck Norris"
            else
                then "ask mom"
       end 
  from endoftheworld
</code></pre>


blocks|key|3376675|text|SQL+SERVER中的Case语句语法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3376676|CASE+column
+++WHEN+value1+THEN+1
+++WHEN+value3+THEN+2
+++WHEN+value3+THEN+3
+++WHEN+value1+THEN+4
+++ELSE+''
END|code-block|syntax|javascript|3376677|我们也可以像下面这样使用：|3376678|CASE+
+++WHEN+column=value1+THEN+1
+++WHEN+column=value3+THEN+2
+++WHEN+column=value3+THEN+3
+++WHEN+column=value1+THEN+4
+++ELSE+''
END|3376679|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

<p>Case statement syntax in SQL SERVER:</p>

<pre><code>CASE column
   WHEN value1 THEN 1
   WHEN value3 THEN 2
   WHEN value3 THEN 3
   WHEN value1 THEN 4
   ELSE ''
END
</code></pre>

<p>And we can use like below also:</p>

<pre><code>CASE 
   WHEN column=value1 THEN 1
   WHEN column=value3 THEN 2
   WHEN column=value3 THEN 3
   WHEN column=value1 THEN 4
   ELSE ''
END
</code></pre>


blocks|key|370804|text|你可以在这里找到一个完整的MySQL+case+statements+in+SQL指南。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|370805|CASE
+++++WHEN+some_condition+THEN+return_some_value
+++++ELSE+return_some_other_value
END|code-block|syntax|javascript|370806|entityMap|0|LINK|mutability|MUTABLE|url|https://geekposting.com/case-statements-in-sql-complete-guide/^0|D|S|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

<p>Here you can find a complete guide for <a href="https://geekposting.com/case-statements-in-sql-complete-guide/" rel="nofollow noreferrer">MySQL case statements in SQL</a>.</p>
<pre><code>CASE
     WHEN some_condition THEN return_some_value
     ELSE return_some_other_value
END
</code></pre>


<p>What is the <strong>complete</strong> and correct syntax for the SQL Case expression?</p>


SQL Case Expression Syntax?

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没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

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什么是SQL Case表达式的complete和正确语法？

问SQL Case表达式语法？
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