SELECT first_name FROM student_details; SELECT Statements: SyntaxNOTE: SQL commands are not case sensitive. The above SELECT statement can also be written as"select first_name from students_details;" You can also retrieve data from more than one column. For example, to select first name and ...
BasicSELECTstatement基本的select语句 The basicsyntax for aSELECT statement is presented below. SELECT语句的基本语法如下。 |:多选一 []:可选择的内容 {}:多选一 没有被{}括起来的是必选 SELECT [DISTINCT |ALL] {* | select_list} FROM {table_name [alias] | view_name} [{table_name [alias] |...
SELECT select_list FROM table_name;Code language: SQL (Structured Query Language) (sql) In this syntax, the SELECT statement has two clauses: SELECT and FROM. First, specify one or more column names after the SELECT keyword. Second, specify the name of the table from which you want to ...
mysql>helpunionSyntax:SELECT...UNION[ALL|DISTINCT]SELECT... [UNION[ALL|DISTINCT]SELECT...] 第一个select语句的column_name会被当做最后查询结果的列名,接下来的每个select语句所一一对应的列应该和第一个语句的列的数据类型最好保持一致 默认情况下union语句会把最终结果中的重复行去掉,这和增加distinct这个关键...
Select ALL columns If you want to return all columns, without specifying every column name, you can use theSELECT *syntax: Example Return all the columns from the Customers table: SELECT*FROMCustomers; Try it Yourself » Video: SQL SELECT Statement ...
Syntax SELECT [predicate] { * | table.* | [table.]field1 [AS alias1] [, [table.]field2 [AS alias2] [, …]]} FROM tableexpression [, …] [IN externaldatabase] [WHERE… ] [GROUP BY… ] [HAVING… ] [ORDER BY… ] [WITH OWNERACCESS OPTION] The SELECT statem...
SQL DELECT Statement Delete All Records SQL TOP, LIMIT or ROWNUM Clause TOP select TOP 3 * from costumers; LIMIT ROWNUM The three syntaxes above are equivalent. TOP PERCENT With a WHERE clause SQL MIN() AND MAX() SQL COUNT(),AVG() and SUM() Functions ...
In X++, the SQL select statement syntax differs from the American National Standards Institute (ANSI) specification. Single Table Select The following table lists differences between the select statements of X++ SQL and ANSI SQL. Feature X++ SQL ...
语法分析Syntax Analysis openGauss中定义了bison工具能够识别的语法文件gram.y,根据SQL语言的不同定义了一系列表达Statement的结构体(这些结构体通常以Stmt作为命名后缀),用来保存语法分析结果。以SELECT查询为例,它对应的Statement结构体如下。 typedef struct SelectStmt { NodeTag type; List *distinctClause; /* NULL...
syntaxsql 复制 <SELECT statement> ::= [ WITH { [ XMLNAMESPACES , ] [ <common_table_expression> [ , ...n ] ] } ] <query_expression> [ ORDER BY <order_by_expression> ] [ <FOR Clause> ] [ OPTION ( <query_hint> [ , ...n ] ) ] <query_expression> ::= { <query_specifica...