TheDROP TABLEstatement is used to drop an existing table in a database. Syntax DROPTABLEtable_name; Note:Be careful before dropping a table. Deleting a table will result in loss of complete information stored in the table! SQL DROP TABLE Example ...
TRUNCATE statement: This command is used to delete all the rows from the table and free the space containing the table.SQL DROP Statement:The SQL DROP command is used to remove an object from the database. If you drop a table, all the rows in the table is deleted and the table ...
The SQL DROP DATABASE StatementThe DROP DATABASE statement is used to drop an existing SQL database.SyntaxDROP DATABASE databasename; Note: Be careful before dropping a database. Deleting a database will result in loss of complete information stored in the database!
*/publicclass TestCreateHiveTableBySQLDemo { static String databaseName="viewtest_db";publicstatic final String tableName="alan_hivecatalog_hivedb_testTable";publicstatic final String hive_create_table_sql="CREATE TABLE "+tableName+" (\n"+" id INT,\n"+" name STRING,\n"+" age INT"+")...
(Some legal select statement) 114 115 CREATE TABLE 以给定的名字在当前数据库创建一个表。允许的表名规则在章节 6.1.2 数据库、表、索引、列和别名 中被给出。如果没有当前数据库或表已经存在,一个错误将会发生。 116 117 在MySQL 3.22 或以后的版本中,表名可以被指定为 db_name.tbl_name。不管有没有当...
If the object exists, execute the drop table statement else, no actions required. 1 2 3 4 5 6 7 8 9 IFEXISTS ( SELECT* FROMsys.objects WHEREobject_id=OBJECT_ID(N'Department') ANDtypeIN(N'U') ) DROPTABLEDepartment; GO Alternatively, we can check the object id of the SQL table an...
When we use the DELETE statement without the WHERE clause, all table rows shall be deleted, but the table structure will remain the same. The syntax for the same is as below: DELETE FROM table_name; The delete statement is used in SQL to delete the current records in the table. Whenever...
-t -- CREATE statement of a table -o <file> -- Save dump in this file. Otherwise print to stdout -l <file> -- Save SQL statements in this file. Otherwise print to stderr -h -- Print this help -d -- Process only those pages which potentially could have deleted records (default...
TheDROP INDEXstatement doesn't apply to indexes created by definingPRIMARY KEYorUNIQUEconstraints. To remove the constraint and corresponding index, useALTER TABLEwith theDROP CONSTRAINTclause. Important The syntax defined in<drop_backward_compatible_index>will be removed in a future version of SQL Se...
When a table is dropped, privileges granted specifically for the table arenotautomatically dropped. They must be dropped manually. SeeSection 13.7.1.4, “GRANT Statement”. If any tables named in the argument list do not exist,DROP TABLEbehavior depends on whether theIF EXISTSclause is given: ...