在MySQL中,我们可以使用IN操作符来传入一个列表。IN操作符用于指定一个字段的值必须匹配列表中的任意一个值。以下是使用IN操作符传入一个列表的基本语法: SELECTcolumn_name(s)FROMtable_nameWHEREcolumn_nameIN(value1,value2,value3,...); 1. 2. 3. 在上述语法中,column_name表示需要匹配的字段,table_name...
partition p3 values less than maxvalue ); 以year(birthdate)表达式(计算员工的出生日期)作为范围分区依据。这里最值得注意的是表达式必须有返回值。 2) 创建list分区 create table emp (empnovarchar(20) not null , empnamevarchar(20), deptnoint, birthdatedatenot null, salaryint ) partition by list(de...
• 对List表分区来说,没有MAXVALUE特殊值,所有的可能取值都需要在VALUES IN中包含,如果有定义的取值则会报错 CREATE TABLE h2 (c1 INT, c2 INT ) PARTITION BY LIST(c1) ( PARTITION p0 VALUES IN (1,4,7), PARTITION p1 VALUES IN (2,5,8)); mysql> INSERT INTO h2 VALUES (3,5); ERROR1525(...
CASEvalueWHEN[compare-value]THEN result[WHEN[compare-value]THEN result...][ELSE result]END CASE WHEN [condition]THEN result[WHEN[condition]THENresult...][ELSE result]END 在第一个方案的返回结果中,value=compare-value。而第二个方案的返回结果是第一种情况的真实结果。如果没有匹配的结果值,则返回结果...
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In MySQL 5.7, it is possible to match against only a list of integers (and possiblyNULL—seeSection 22.2.7, “How MySQL Partitioning Handles NULL”) when partitioning byLIST. However, other column types may be used in value lists when employingLIST COLUMNpartitioning, which is described later...
INSERT [INTO] table_name[(column [, column] ...)]VALUES (value_list) [, (value_lisvalue_list: value, [, value] ... 看着语法非常复杂,那我们结合案例来看。 案例: 先创建一张学生表mysql> create table stu( -> id int primary key, -> name varchar(5) -> ); ...
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7、 unique_subquery该类型替换了下面形式的IN子查询的ref: value IN (SELECT primary_key FROM single_table WHERE some_expr) unique_subquery是一个索引查找函数,可以完全替换子查询,效率更高。 8、 index_subquery该联接类型类似于unique_subquery。可以替换IN子查询,但只适合下列形式的子查询中的非唯一索引: va...
VALUES row_constructor_list[ORDER BY column_designator][LIMIT BY number] row_constructor_list: ROW(value_list)[, ROW(value_list)][, ...]value_list: value[, value][, ...]column_designator: column_index VALUES 语句,用做功能展示或者快速造数据场景,结果列名字以 COLUMN_0 开头,以此类推,举个...