INFILE "users_data.csv" --指定外部数据文件,可以写多个 INFILE "another_data_file.csv" 指定多个数据文件 // INFILE 'tt.date' // 导入多个文件 --这里还可以使用 BADFILE、DISCARDFILE 来指定坏数据和丢弃数据的文件, truncate --操作类型,用 truncate table 来清除表中原有记录 INTO TABLE users -- 要...
If partition_scheme is specified, the table is to be a partitioned table whose partitions are stored on a set of one or more filegroups specified in partition_scheme. If filegroup is specified, the table is stored in the named filegroup. The filegroup must exist within the database. If "...
You can copy data from one table to another in a single database (local or remote). To copy between tables in your local database, specify your own username and password and the service name for your local database in either a FROM or a TO clause (omit the other clause): COPY FROM ...
This is specific to PostgreSQL. I am building dynamic code based on the the information_schema, in particular the table information_schema.columns, which is defined in the ISO SQL standard and most modern RDBMS (except for Oracle) support it. But a DO statement with PL/pgSQL code executing ...
If partition_scheme is specified, the table is to be a partitioned table whose partitions are stored on a set of one or more filegroups specified in partition_scheme. If filegroup is specified, the table is stored in the named filegroup. The filegroup must exist within the database. If "...
型の名前をxsql_table_of_varchar以外に変更することはできませんが、VARCHAR2文字列の次元は必要に応じて変更できます。配列値文字列のパラメータを扱う文字列値と同じ長さにする必要があります。 例25-6のPL/SQLファンクションについて考えてみます。 例25-7のXSQLページに、testTableFunct...
Backs up a complete SQL Server database to create a database backup, or one or more files or filegroups of the database to create a file backup (BACKUP DATABASE). Also, under the full recovery model or bulk-logged recovery model, backs up the transaction log of the database to create...
You can use the following custom SQL query to append the second table, December, to the first table, November: SELECT * FROM November UNION ALL SELECT * FROM December The result of the query looks like this in the data grid: For more information about the union option, see Union Your Da...
Statistics for query optimization are binary large objects (BLOBs) that contain statistical information about the distribution of values in one or more columns of a table or indexed view. The Query Optimizer uses these statistics to estimate thecardinality, or number of rows, in the query result....
Backs up a complete SQL Server database to create a database backup, or one or more files or filegroups of the database to create a file backup (BACKUP DATABASE). Also, under the full recovery model or bulk-logged recovery model, backs up the transaction log of the database to create...