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In my database there are tables below:
temp;
2012;
2013;
2014;
2015;
I'd like to list the tables except temp
It should be something like
show tables from database like ...;
I also tried the operator NOT
But I failed. Can anyone help me for a correct SQL command?
select table_schema
from information_schema.tables
where table_schema <> 'temp'
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i saved a table in my SSMS database but its not showing even after i refresh it. any idea what should be done??
Try reconnect and asure yourself that you are creating table rather than temporary table which disapear after closing or interupting session.
When reconnect will help. It means that table was created but only view of it wasn't available yet.
Data from temporary table begin name with # sign. To check if you using temporary table you can perform code shown below:
if object_id('tempdb..#yourtablename') is null
PRINT N'Temporary table is not created';
if object_id('tempdb..#yourtablename') is not null
PRINT N'Temporary table is created';
if object_id('dbo.yourtablename') is null
PRINT N'Normal table is not created';
if object_id('dbo.yourtablename') is not null
PRINT N'Normal table is created';
Make sure that you are in the database where you previously created the table
A couple of basics you can try for this:
Try running:
SELECT * FROM [<YOUR_DATABASE>..<YOUR_TABLE>];
If an exception is returned, the table did not create.
In the left sidebar, expand:
Databases > your db > Tables
Right-click tables and press 'refresh'. See if it appears in the list.
If not, the table did not create.
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I have a project where I must retrieve the data from a table, for example the column name, the size, if it is null or not, the problem is that I cannot use the following methods, and everything must be in a query, Can't use the console, does anyone know a solution?
I can't use this:
SHOW COLUMNS IN world.city;
SHOW CREATE TABLE world.city;
The INFORMATION_SCHEMA database contains information about each table in the db - see information schema as show alternative, information schema table reference from the MySQL docs.
You can SELECT the data you need directly from tables in INFORMATION_SCHEMA.
For example:
USE INFORMATION_SCHEMA;
SELECT TABLE_NAME FROM COLUMNS
WHERE TABLE_SCHEMA = <your_database_name>
should get you the names of all the tables in your database.
In python :
#define `db` engine
com_schema ="SELECT COLUMN_NAME, DATA_TYPE, IS_NULLABLE, COLUMN_DEFAULT FROM INFORMATION_SCHEMA.COLUMNS WHERE table_name =
'tbl_name';"
with db.connect() as conn:
status = conn.execute(com_schema).fetchall()
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I am trying to rename a column in a table in my DB. I already tried
ALTER TABLE TableName RENAME COLUMN OldColumnName TO NewColumnName
and i am getting an error reply saying - You have an error in your SQL syntax; Please whats the right syntax for this? Thanks.
Try using this syntax:
ALTER TABLE TableName CHANGE OldColumnName NewColumnName varchar(10) ;
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with "drop table if exists student"
without "drop table if exists student"
So,I connected the database to amazon rds.
I want to find the way to avoid the error without using "drop and flush".
I've spent few days to find the solution, but i haven't found any.
Thanks for all your help!
I think what you are looking for is CREATE TABLE IF NOT EXISTS Student.
For the whole mysql create table Syntax look at the official documentation
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I have a database called "members" and in that there's a table called "test". I'm trying to add a column to the table "test" but am getting the following error
MySQL Error 1064: You have an error in your SQL syntax.
My SQL code:
ALTER TABLE 'test'
ADD COLUMN 'Email' VARCHAR(25)
NULL AFTER 'LastName';
alter table classtest add column Email varchar(25);