The SHOW TABLES SQL command is used to display all the tables in a MySQL database to make formatting easier. Formatting is vital to database use.
ALTERTABLEtable_nameMODIFYCOLUMNcolumn_name datatype; Example Following query modifies datatype of SALARY column in MySQL CUSTOMERS table − ALTERTABLECUSTOMERSMODIFYCOLUMNIDDECIMAL(18,4); This will produce the following output − Query OK, 0 rows affected (0.003 sec) Records: 0 Duplicates: 0 ...
Execute the “\d” command followed by the table name to describe a specific table in Postgres: \d emp_data; The above-stated command will describe the “emp_data” table: The stated command retrieves all the details regarding the “emp_data” table, such as column names, column types, ...
The DESCRIBE command lists the column definitions for a database table. You can use it to view procedure, function, package, and object definitions. If you have created and loaded the sample tables described in Chapter 1, you can use the DESCRIBE command to view their column definitions. The...
DESCRIBE Lists the column definitions for the specified table, view or synonym, or the parameter specifications for the specified function or procedure. The result is displayed in the Data window. EXECUTE Executes a single PL/SQL statement. ...
Sets the depth of the level to which you can recursively describe an object (1 to 50) see theDESCRIBEcommand ECHO {OFF|ON} Display commands as they are executed EMB[EDDED] {OFF|ON} OFF = report printing will start at the top of a new page. ...
Step 3: Describe a Table Let’s run the“\d”command followed by the table name to see all the columns present in the selected table: \d staff_details; Step 4: Rename the Column Suppose we have to rename the“staff_location”column to“staff_address”. Execute the“RENAME COLUMN”comman...
describe 表名; 建库与删库: create database 库名; drop database 库名; 建表: use 库名; create table 表名(字段列表); drop table 表名; 清空表中记录: delete from 表名; 显示表中的记录: select * from 表名; 第五招、导出和导入数据 ...
Impala - Create Table Statement Impala - Insert Statement Impala - Select Statement Impala - Describe Statement Impala - Alter Table Impala - Drop a Table Impala - Truncate a Table Impala - Show Tables Impala - Create View Impala - Alter View Impala - Drop a View Impala - Clauses Impala -...
describe eschar flagger flush fullcolname logsource loboffset markup recsep recsepchar shiftinout sqlcase sqlprefix sqlterminator tab underline xmloptimizationcheck 1.3 Starting and Leaving SQLcl Use the following commands to log in to and out of SQLcl. SQLCL [[option] ...