The table’s storage space is released by the drop statement. Although if we delete all of the rows from the Delete statement, the Table structure is still present, so memory is not released. Overview of SQL Drop Table A table and all of its rows can be deleted with the drop table com...
Thus, it prevents the old way of writing if condition and inside the if condition writing a statement to test the object’s presence to drop it. If it does not occur, the next statement in the batch will continue to be executed. But if we try to drop an object that does not exist ...
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TRUNCATE TABLEremoves all rows from a table, but the table structure and its columns, constraints, indexes, and so on, remain. To remove the table definition in addition to its data, use theDROP TABLEstatement. If the table contains an identity column, the counter for that column is reset...
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1 、普通SQL语句可以用Exec执行 eg: Select * from tableName Exec('select * from tableName') Exec sp_executesql N'select * from tableName' -- 请注意字符串前一定要加N 2、字段名,表名,数据库名之类作为变量时,必须用动态SQL eg: declare @fname varchar(20) set @fname = 'FiledName' Select...
1.2 Create/Drop/Truncate Table 1.2.1 Create Table 1.2.1.1 语法 CREATE[TEMPORARY] [EXTERNAL]TABLE[IFNOTEXISTS] [db_name.]table_name-- (Note:TEMPORARY available in Hive 0.14.0 and later)[(col_name data_type [COMMENT col_comment], ...)] ...
TRUNCATE TABLEremoves all rows from a table, but the table structure and its columns, constraints, indexes, and so on, remain. To remove the table definition in addition to its data, use theDROP TABLEstatement. If the table contains an identity column, the counter for that column is reset...
DROP causes Oracle to fire the trigger whenever a DROP statement removes a database object from the data dictionary. Restriction: DDL triggers are supported only for the following database objects: cluster, function, index, package, procedure, role, sequence, synonym, table, tablespace, trigger...
Action: Drop the table level options statement if this is not the intent. SQL*Loader-00278 Incorrect file specification for parallel load. Cause: The file name used to perform the parallel load was entered incorrectly. Action: Correct the file name and re-invoke parallel loader. SQL*Loader-002...