SQL Alias Syntax By Dinesh Thakur You can rename a table or a column temporarily by giving another name known as alias. The term alias means an alternate name. Here’s an example of how to use a column alias SELECT empno,hiredate,sal, ename AS 'Name' FROM emp; Notice that the colum...
SQLRETURN SQLTables( SQLHSTMT StatementHandle, SQLCHAR * CatalogName, SQLSMALLINT NameLength1, SQLCHAR * SchemaName, SQLSMALLINT NameLength2, SQLCHAR * TableName, SQLSMALLINT NameLength3, SQLCHAR * TableType, SQLSMALLINT NameLength4); 参数...
SELECT column-name AS alias-name FROM table-name WHERE conditionSyntax for a table alias.SELECT column-names FROM table-name alias-name WHERE conditionMore ExamplesSELECT with Column and Table Aliases CUSTOMER Id FirstName LastName City Country Phone ...
SQL StatementSyntax AND / ORSELECT column_name(s) FROM table_name WHERE condition AND|OR condition ALTER TABLEALTER TABLE table_name ADD column_name datatype or ALTER TABLE table_name DROP COLUMN column_name AS (alias)SELECT column_name AS column_alias ...
syntaxsql 複製 FROM { <table_source> [ , ...n ] } <table_source> ::= { [ database_name . [ schema_name ] . | schema_name . ] table_or_view_name [ AS ] table_or_view_alias [ <tablesample_clause> ] | derived_table [ AS ] table_alias [ ( column_alias [ , ...n ]...
Aliases in SQL: Syntax & Examples Next Lesson Practical Application for Database Programming: Displaying Data from Different Tables Ch 6.Data Queries in Multiple Tables Using... Ch 7.Views & Indexes in Databases Ch 8.Modifying Tables in Databases ...
A、CREATE TABLE 表名1 as select a1,a2 from 表名2 definition only; **将表名2中a1,a2列拿出来单独作为一个表 B、create table 表名1 like 表名2; **使用旧表创建新表 !!! SQL语言对大小写不敏感 6、drop table 表名; **删除新表
不用写FROM table_a, JOIN table_b, ON 连接条件 不用写JOIN,WHERE替换ON -- Implicit Join Syntax隐式连接语法 SELECT * FROM orders o, customers c WHERE o.customer_id = c.customer_id 虽然MySQL支持隐式连接语法,但最好不要用 // 因为如果不小心忘记打WHERE子句 // 就会得到Cross Join交叉连接 -...
SQL AS Alias Syntax The syntax of the SQL AS command is: SELECT column_1 AS alias_1, column_2 AS alias_2, ... ...column_n AS alias_n FROM table_name; Here, column_1, column_2,...column_n are the table columns alias_1, alias_2,...alias_n are the aliases of the table ...
syntaxsql 复制 SELECT [ ALL | DISTINCT ] [ TOP ( expression ) [ PERCENT ] [ WITH TIES ] ] <select_list> <select_list> ::= { * | { table_name | view_name | table_alias }.* | { [ { table_name | view_name | table_alias }. ] { column_name | $IDENTITY | $ROWGUID ...