Knowing only the name of a table, is there a way in SQL to query the structure of the table so I can inspect the columns?
This works in MS SQL server.This will show you column datatype and size.
select * from INFORMATION_SCHEMA.COLUMNS where TABLE_NAME='<Table Name>'
Related
I want to get the column count in the given table in SQL. I'm using the DBeaver to do the queries.
Is that connected to a postgres database? Try this script see if it gives you the column count you are a looking for. Remove the aggregate function and it'll give you a lot more system related info on that table
SELECT COUNT(Column_Name) AS ColumnCount
FROM information_schema.columns
WHERE table_schema = 'name of schema'
AND table_name = 'table name';
Is there a query I can write to search all the column names for a particular database in Netezza?
Within the same database you can use the following query:
select *
from _v_odbc_columns1
where column_name like '%columnname%'
or a less Netezza specific query
select *
from information_schema.columns
where column_name like '%columnname%'
The important catalog views in netezza system are listed below
_V_USER: the user view gives information about the users in the netezza system.
_V_TABLE: the table view contains the list of tables created in the netezza performance system.
_V_RELATION_COLUMN: the relation column system catalog view contains the columns available in a table.
_V_TABLE_INDEX: this system catalog contains the information about the
indexes created on table. netezza does not support creating indexes on a table as of now.
_V_OBJECTS: lists the different objects like tables, view, functions etc. available in the netezza.
Example:
SELECT *
FROM _V_RELATION_COLUMN
WHERE
ATTNAME like '%GEO%' --SPECIFY COLUMN NAME
AND type = 'TABLE'
You would access something similar to an information_schema.
Column Name, %COW%', would use % as a wildcard...gathering any column that has 'COW' in the name
SELECT *
FROM _V_SYS_COLUMNS
WHERE
COLUMN_NAME like '%COW%'
AND TABLE_SCHEMA = 'DEV'
ORDER BY TABLE_NAME
;
I have a database with over a 150 tables. I need to be able to find every table that has a column called EmployeeID. Is there a way for me to find all tables that have this column? It's kind of a long process if I go through each table and try to find if it has that column.
Use INFORMATION_SCHEMA.COLUMNS:
select c.*
from INFORMATION_SCHEMA.COLUMNS c
where column_name = 'EmployeeID';
Is there a query I can write to search all the column names for a particular database in Netezza?
Within the same database you can use the following query:
select *
from _v_odbc_columns1
where column_name like '%columnname%'
or a less Netezza specific query
select *
from information_schema.columns
where column_name like '%columnname%'
The important catalog views in netezza system are listed below
_V_USER: the user view gives information about the users in the netezza system.
_V_TABLE: the table view contains the list of tables created in the netezza performance system.
_V_RELATION_COLUMN: the relation column system catalog view contains the columns available in a table.
_V_TABLE_INDEX: this system catalog contains the information about the
indexes created on table. netezza does not support creating indexes on a table as of now.
_V_OBJECTS: lists the different objects like tables, view, functions etc. available in the netezza.
Example:
SELECT *
FROM _V_RELATION_COLUMN
WHERE
ATTNAME like '%GEO%' --SPECIFY COLUMN NAME
AND type = 'TABLE'
You would access something similar to an information_schema.
Column Name, %COW%', would use % as a wildcard...gathering any column that has 'COW' in the name
SELECT *
FROM _V_SYS_COLUMNS
WHERE
COLUMN_NAME like '%COW%'
AND TABLE_SCHEMA = 'DEV'
ORDER BY TABLE_NAME
;
Sir,
I've a problem regarding Database.
My problem is I've Database script file.When I integtrated the script file in Database.I found all the stored procedure is visible.But tables are not visible.
I wrote the Command as follows:
select * from sysobjects where type='p'
Now all the tables is showing but fields are not.
I wrote the Command to get the fields for particular table_name targeted as
select * from table_name .
But a message is Coming like Invalid Object name as table_name.
Please help me out to find the fields of the table ...
You can use the following query to retrieve the columns of the sought-for table:
SELECT *
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_NAME = 'your table name'
You can list all columns with:
select * from sys.columns