Alias refers to the practice of using a different temporary name (usually a short name or a name with a logical meaning) to a database table or a column in a table. The main advantage of using an alias is to h
IN 操作符允许我们在 WHERE 子句中规定多个值。 SQL IN 语法 SELECT column_name(s) FROM table_name WHERE column_name IN (value1,value2,...) 原始的表 (在实例中使用:) Persons 表: IN 操作符实例 现在,我们希望从上表中选取姓氏为 Adams 和 Carter 的人: 我们可以使用下面的 SELECT 语句: SELECT ...
代码语言:sql 复制 SELECT column1 AS alias_column FROM table_name WHERE alias_column = 'some_value'; 在这个示例中,我们将column1定义为alias_column,然后在WHERE子句中使用这个别名来过滤数据。 需要注意的是,在PostgreSQL中,我们不能在WHERE子句中直接使用SELECT子句中定义的别名。为了实现这一点,我们需要使用...
1.为列名称好的表名称指定别名(Alias) 2.表的语法 SELECT column_name(s)FROMtable_nameAS alias_name 列的语法 SELECTcolumn_nameAS alias_nameFROM table_name
gfmtopt.case_column_alias, type of TCaseOption Java TODO Uniform Alias column name has a dedicated case option. Option: fmt110_case_column_alias_name = upper, type: TFmtCase. SELECT p.name AS PRODUCT, p.listprice AS 'LIST PRICE', p.discount AS 'DISCOUNT' FROM production.product ...
* 字段名映射,隐藏真实字段名,对安全要求很高的表可以这么做,另外可以配置 name_tag:(name,tag) 来实现多字段 IN,length_tag:length(tag) 来实现 SQL 函数复杂条件 */ public static Map<String, String> COLUMN_KEY_MAP; /** * 允许批量增删改部分记录失败的表 */ ...
Adding a Value to a 'date' Column caused an overflow?? Adding Column to existing table with variable column name Adding Days to Date Field Adding leading zeroes (PADDING in SQL Server) adding new column in my linked server Adding NOT NULL DEFAULT VALUE column to existing table with data Add...
SELECTfirst_nameASnameFROMCustomers; Run Code Here, the SQL command selects thefirst_namecolumn ofCustomers. However, the column name will change tonamein the result set. Example: SQL AS Alias SQL AS With More Than One Column We can also use aliases with more than one column. ...
SQL Server Invalid column name with alias and HAVINGAggregation (and therefore also the HAVING ...
AlterTableAlterColumnStatement AlterTableAlterIndexStatement AlterTableAlterPartitionStatement AlterTableChangeTrackingModificationStatement AlterTableConstraintModificationStatement AlterTableDropTableElement AlterTableDropTableElementStatement AlterTableFileTableNamespaceStatement AlterTableRebuildStatement Al...