-- select the unique ages from the Customers tableSELECTDISTINCTageFROMCustomers; Here, the SQL command selects only the unique values of age from theCustomerstable. Syntax of SQL SELECT DISTINCT SELECTDISTINCTcolumn1, column2 ...FROMtable; Here, column1, column2, ...are the table columns t...
Syntax:SELECT[ALL | DISTINCT | DISTINCTROW][HIGH_PRIORITY][STRAIGHT_JOIN][SQL_SMALL_RESULT][SQL_BIG_RESULT][SQL_BUFFER_RESULT]SQL_NO_CACHE[SQL_CALC_FOUND_ROWS]select_expr[, select_expr ...][FROM table_references [PARTITION partition_list][WHERE where_condition][GROUP BY {col_name | expr ...
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...
SQL SELECT SQL SELECT DISTINCT SQL WHERE where clause SQL AND,OR AND NOT Operators SQL ORDER BY ASC:ascending/ DESC:descending SQL INSERT INTO If you are adding values for all the columns of the table, you do not need to specify the column names in the SQL query....
Windows Installer 的 SQL 查询字符串限制为以下格式。 展开表 行动查询 选择一组记录 SELECT [DISTINCT]{column-list} FROM {table-list} [WHERE {operation-list}] [ORDER BY {column-list}] 从表中删除记录 DELETE FROM {table} [WHERE {operation-list}] 修改表中的现有记录 UPDATE {table-list} SET ...
syntaxsql 複製 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 }...
sql SELECT last_name "Name", salary*12 "Annual Salary" FROM employees; 去除重复行 默认情况下,查询会返回全部行,包括重复行。 SELECTdepartment_idFROMemployees; 在SELECT语句中使用关键字DISTINCT去除重复行 SELECTDISTINCTdepartment_idFROMemployees;
SELECTDISTINCTCountryFROMCustomers; Try it Yourself » Inside a table, a column often contains many duplicate values; and sometimes you only want to list the different (distinct) values. Syntax SELECTDISTINCTcolumn1,column2, ... FROMtable_name; ...
尝试从select插入时出现SQL语法错误 Access UNION SQL查询语法错误消息 select中的简单SQL update语句出现意外结果 "SELECT DISTINCT _id near“SELECT中的语法错误 Hibernate查询语言:获取查询的SQL语法错误 SQL SELECT查询无结果且无错误 在JS中调用sql查询时出现语法错误 ...
SELECT column_name(s)FROM table_name1 JOIN table_name2 ON table_name1.column_name=table_name2.column_name JOIN: 可以是 INNER JOIN、LEFT JOIN、RIGHT JOIN 或 FULL JOIN。 DISTINCT:用于返回唯一不同的值。 SELECT DISTINCT column_name(s)FROM table_name ...