-- select all columns from Customers table with first name 'John'SELECT*FROMCustomersWHEREfirst_name ='John'; Run Code The above SQL command selects all the customers from theCustomerstable havingfirst_nameJohn. 2. Greater than (>) -- select all columns from Customers table with age greater...
Syntax:SELECT[ALL|DISTINCT|DISTINCTROW ] [HIGH_PRIORITY] [STRAIGHT_JOIN] [SQL_SMALL_RESULT] [SQL_BIG_RESULT] [SQL_BUFFER_RESULT] [SQL_CACHE|SQL_NO_CACHE] [SQL_CALC_FOUND_ROWS] select_expr [, select_expr ...] [FROMtable_references [PARTITIONpartition_list] [WHEREwhere_condition] [GROUPBY...
[SQL_CACHE | SQL_NO_CACHE] [SQL_CALC_FOUND_ROWS] select_expr [, select_expr ...] [FROMtable_references [PARTITION partition_list] [WHEREwhere_condition] [GROUPBY{col_name | expr | position} [ASC | DESC], ... [WITHROLLUP]] [HAVING where_condition] [ORDERBY{col_name | expr | pos...
syntaxsql 复制 [ WITH <common_table_expression> [ , ...n ] ] SELECT <select_criteria> [ ; ] <select_criteria> ::= [ TOP ( top_expression ) ] [ ALL | DISTINCT ] { * | column_name | expression } [ , ...n ] [ FROM { table_source } [ , ...n ] ] [ WHERE <search...
SELECT * FROM employees WHERE last_name='King'; SELECT * FROM employees WHERE last_name='king'; 该语句的查询结果与上面相同 原因:在 windows 环境下,对大小写不敏感导致 MySQL 中对大小写也不敏感,但是由于 MySQL 的不严谨导致字符串中的大小写也不进行区分,所以上面的两句结果相同。 在其他数据中不会...
sql SELECT employee_id, last_name, job_id, department_id FROM employees WHERE department_id = 90 ; 第3章实验操作 #第03章_基本的SELECT语句 #1. SQL的分类 DDL:数据定义语言。CREATE \ ALTER \ DROP \ RENAME \ TRUNCATE DML:数据操作语言。INSERT \ DELETE \ UPDATE \ SELECT (重中之重) DCL:...
Syntax:SELECT [ALL | DISTINCT | DISTINCTROW ][HIGH_PRIORITY][STRAIGHT_JOIN][SQL_SMALL_RESULT] [SQL_BIG_RESULT] [SQL_BUFFER_RESULT][SQL_CACHE | SQL_NO_CACHE] [SQL_CALC_FOUND_ROWS]select_expr [, select_expr ...][FROM table_references [PARTITION partition_list][WHERE where_condition][...
如果您使用的是按需付费模式,则导致费用增加;如果您使用包年包月付费模式,则会导致SQL计算性能下降。 命令格式 [WITH <cte>[, ...] ] SELECT [ALL | DISTINCT] <SELECT_expr>[, <EXCEPT_expr>][, <REPLACE_expr>] ... FROM <TABLE_reference> [WHERE <WHERE_condition>] [GROUP BY {<col_list>|...
业务层传递数据,在映射文件取值时where语句理论上应写为where user_name like #{user_name}%,但实际上控制台会报错。 ### Error querying database. Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL...
SQL 复制 USE AdventureWorks2022; GO SELECT AVG(UnitPrice) AS [Average Price] FROM Sales.SalesOrderDetail; column_alias 可以用于 ORDER BY 子句。 但不能用于 WHERE、GROUP BY 或 HAVING 子句中。 如果查询表达式是 DECLARE CURSOR 语句的一部分,则不能在 FOR UPDATE 子句中使用 column_alias。