select_statement:必填。子查询语句。格式请参见SELECT语法。 sq_alias_name:可选。子查询的别名。 table_name:必填。目标表名称。 使用示例 示例1:子查询语法的命令示例如下。 set odps.sql.allow.fullscan=true; select * from (select shop_name from sale_detail)
This statement is used to nest subquery by FROM and use the subquery results as the data source of the external SELECT statement.All is used to return repeated rows. By d
1. 子查询定义 Any sub-query block in a query statement may be called a subquery; however, we use the term subquery for a sub-query block that appears in the WHERE, SELECT and HAVING clauses. Some Oracle documentation uses the term "nested subquery" for what we refer to as a subquery....
SQL Tutorial, Subquery: Inner Queries Explanation Subqueries can be used in a SET UPDATE clause of an UPDATE statement. In this case, the subquery must produce a result table that contains a maximum of one row. Subqueries can be used in an INSERT statement. Subqueries can be used in the...
You can write a subquery in an expression or in a Structured Query Language (SQL) statement in SQL view. In this article Use the results of a query as a field in another query Use a subquery as a criterion for a query field Common SQL keywords that...
When you use a correlated subquery in an UPDATE statement, the correlation name refers to the rows that you want to update.
sql_cond - subquery Syntax ... ( SELECT{select_clause FROMsource} |{FROMsource FIELDSselect_clause} [WHEREsql_cond] [GROUP BYgroup][HAVINGgroup_cond] [UNION[ALL|DISTINCT]select]) ... Effect Asubqueryof theWHEREcondition is a parenthesizedSELECTstatement in which all additions exceptSINGLE,...
Microsoft.SqlServer.TransactSql.ScriptDom AbortAfterWaitType AcceleratedDatabaseRecoveryDatabaseOption AddAlterFullTextIndexAction AddFileSpec AddMemberAlterRoleAction AddSearchPropertyListAction AddSensitivityClassificationStatement AddSignatureStatement AdHocDataSource ...
SQL is dynamic enough to handle queries within queries. These inner queries are called subqueries and they can be used in many different sections of another query. In this video we will use subqueries within a where clause, a join statement, and as a column value. ...
for each department, you need to find the employee number from the EMPLOYEE table that matches the manager number in the DEPARTMENT table and return the name for the row that matches. Only departments that currently have managers assigned are to be returned. Execute the following SQL statement:...