run(r).executeQuery(); int columns = result.getMetaData().getColumnCount(); while (result.next()) { System.out.println(result.getString(1) + " " + result.getString(2) + " " + result.getString(3)); } } } 结果展示 代码语言:javascript 代码运行次数:0 运行 AI代码解释 ==> ...
ALTER TABLE modifies a table definition by altering, adding, or dropping columns and constraints. ALTER TABLE also reassigns and rebuilds partitions, or disables and enables constraints and triggers.
( TRACK_COLUMNS_UPDATED = { ON | OFF } ) ] | SWITCH [ PARTITION source_partition_number_expression ] TO target_table [ PARTITION target_partition_number_expression ] [ WITH ( <low_priority_lock_wait> ) ] | SET ( [ FILESTREAM_ON = { partition_scheme_name | filegroup | "default" |...
Wrong Schema Linking(41.6%) pertains to the scenario where ChatGPT can accurately comprehend the structure of the database, but erroneously associates it with inappropriate columns and tables. Misunderstanding Database Content(40.8%) occurs when ChatGPT either fails to recall the correct database stru...
out.println("传入的是全部列:" + allColumns); //判断表达式是否是列 } else if (expression instanceof Column) { System.out.println("查询值:" + ((Column) expression).getColumnName()); } } // System.out.println("表名:" + tableList); Expression where = plain.getWhere(); if (where ...
SQL3507NThe column number specified for a null indicator is not in the valid range of 0 to 32767 or the null indicator parameter is not valid. Explanation In thenull_indparameter, columns for null indicators were specified for an ASC file but one of the columns is not valid or the pointe...
查询计划中的联接顺序为 Table1、 Table2、 TableA、 TableB、 Table3。解析视图的索引与任何索引相同,仅当查询优化器确定在 SQL Server 的查询计划中使用索引视图有益时,SQL Server 才会选择这样做。索引视图可以在任何版本的 SQL Server 中创建。 在某些较早版本的 SQL Server 中,查询优化器会自动考虑索引视图...
-- Pivot table with one row and five columnsSELECT'AverageCost'ASCostSortedByProductionDays, [0], [1], [2], [3], [4]FROM(SELECTDaysToManufacture, StandardCostFROMProduction.Product )ASSourceTablePIVOT(AVG(StandardCost)FORDaysToManufactureIN([0], [1], [2], [3], [4]) )ASPivotTable...
下表描述了行正文大小的计算,以 <actual row body size> = SUM(<size of shallow types>) + 2 + 2 * <number of deep type columns> 表示。 展开表 部分大小注释 浅表类型列 SUM(<size of shallow types>)。 各类型的大小(字节数)如下:bit:1tinyint:1smallint:2int...
SELECT cno,cname,count(sno),MAX(sno) FROM tbl_student_class GROUP BY cno; 执行报错了 [Err] 1055 - Expression #2 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'test.tbl_student_class.cname' which is not functionally dependent on columns in GROUP BY clause; ...