Example 1: Select All Columns Except One One of the common tasks of “select except” is where you need to select all the columns of a table except one. Let us take the Sakila sample database. Suppose we wish to retrieve all the columns from the “film” table except the “description...
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SELECT 昵称=nickname,电子邮件=email FROM testtable 4、删除重复行 SELECT语句中使用ALL或DISTINCT选项来显示表中符合条件的所有行或删除其中重复的数据行,默认为ALL。使用DISTINCT选项时,对于所有重复的数据行在SELECT返回的结果集合中只保留一行。 5、限制返回的行数 使用TOP n [PERCENT]选项限制返回的数据行数,TOP...
where col1 not in(SELECT col3 FROM Tablec) group by col1 结果如下: col1 --- 2 3 4 --INTERSECT运算符优先于EXCEPT --运算步骤是:先运算TableB和TableC的INTERSECT,再和TableA运算EXCEPT SELECT col1 FROM TableA EXCEPT SELECT col2 FROM TableB INTERSECT SELECT col3 FROM TableC 结果如下: co...
使用SQL语句进行查询操作时,若希望查询结果中不出现重复元组,应在SELECT子句中使用的保留字是UNIQUE ALL EXCEPT DISTINCT
(c1, c2), VALUES(3, 4) AS t2(c3, c4); 3 4 -- select all referencable columns from all tables except t2.c4 > SELECT * EXCEPT(c4) FROM VALUES(1, 2) AS t1(c1, c2), VALUES(3, 4) AS t2(c3, c4); 1 2 3 -- select all referencable columns from a table, except a ...
(1)Select 查询语句 语法:SELECT [ALL|DISTINCT] <目标列表达式> [AS 列名] [,<目标列表达式> [AS 列名] ...] FROM <表名> [,<表名>…] [WHERE <条件表达式> [AND|OR <条件表达式>...] [GROUP BY 列名 [HAVING <条件表达式>> [ORDER BY 列名 [ASC | DESC> ...
select dbid, name AS DB_NAME from master..sysdatabases where sid <> 0x01 8.查询某一个表的字段和数据类型 select column_name,data_type from information_schema.columns where table_name = '表名'9.使用事务 在使用一些对数据库表的临时的SQL语句操作时，可以采用SQL SERVER事务处理，防止...
SELECT column1, column2,..., columnN FROM table1, table2,..., tableN [Conditions] //optional EXCEPT SELECT column1, column2,..., columnN FROM table1, table2,..., tableN [Conditions] //optional The number and order of columns in both SELECT statements should be the same.Example...
Except、Intersect、Union三种set符号是默认进行unique处理,当进行unique处理时会进行如下两步操作 1. PROC SQL eliminates duplicate (nonunique) rows in the tables. 2. PROC SQL selects the rows that meet the criteria and, where requested, overlays columns. ...