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 help make the SQL statement more concise and readable. In addition, the ...
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 ...
SELECT * FROM ( SELECT column1 AS alias_column FROM table_name ) AS subquery_alias WHERE subquery_alias.alias_column = 'some_value'; 以下是使用CTE的示例: 代码语言:sql 复制 WITH cte_alias AS ( SELECT column1 AS alias_column FROM table_name ) SELECT * FROM cte_alias WHERE cte_alias.al...
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 ...
name and name_of_alias is the alternative or temporary name with which the table of the column to which it is assigned can be referred further in the query statement. We can use the aliases for columns as well as for tables. We will study in a described way each of the cases further...
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. ...
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...
* 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 */ ...
Bug #78009 Inconsistent behaviors when column alias name(s) and column name are the same Submitted: 10 Aug 2015 11:25Modified: 10 Aug 2015 14:47 Reporter: Su Dylan Email Updates: Status: Not a Bug Impact on me: None Category: MySQL Server: DMLSeverity: S3 (Non-critical) Version: ...