You can rename a column using the sp_rename
system stored procedure:
EXEC sp_rename 'YourTableName.OldColumnName', 'NewColumnName', 'COLUMN';
This renames OldColumnName
to NewColumnName
in the specified table.
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You can rename a column using the sp_rename
system stored procedure:
EXEC sp_rename 'YourTableName.OldColumnName', 'NewColumnName', 'COLUMN';
This renames OldColumnName
to NewColumnName
in the specified table.
To grant access to a user for a specific database, use the following commands:
Create a login (if it doesn't already exist):
CREATE LOGIN YourLoginName WITH PASSWORD = 'YourPassword';
Grant access to the database:
USE YourDatabaseName; CREATE USER YourLoginName FOR LOGIN YourLoginName;
Grant a role or specific permissions:
EXEC sp_addrolemember 'db_datareader', 'YourLoginName'; -- Grants read access
To execute a stored procedure, use the EXEC
command followed by the procedure name and any necessary parameters:
EXEC YourStoredProcedureName @Param1 = 'Value1', @Param2 = 'Value2';
Replace YourStoredProcedureName
with the name of the stored procedure and provide the required parameter values.
You can retrieve the list of all stored procedures using the following query:
SELECT
name AS ProcedureName,
create_date,
modify_date
FROM
sys.procedures
ORDER BY
name;This returns all stored procedures along with their creation and modification dates.
To get a list of all foreign keys in the current database, use the following query:
SELECT f.name AS ForeignKey, OBJECT_NAME(f.parent_object_id) AS TableName, COL_NAME(fc.parent_object_id, fc.parent_column_id) AS ColumnName, OBJECT_NAME(f.referenced_object_id) AS ReferencedTable, COL_NAME(fc.referenced_object_id, fc.referenced_column_id) AS ReferencedColumn FROM sys.foreign_keys AS f INNER JOIN sys.foreign_key_columns AS fc ON f.object_id = fc.constraint_object_id;
This query returns all foreign key constraints, including the related tables and columns.
You can update data in one table using values from another table by using a join in the UPDATE
statement:
UPDATE t1
SET t1.ColumnToUpdate = t2.NewValue
FROM YourTable1 t1
INNER JOIN YourTable2 t2
ON t1.ID = t2.ID
WHERE t2.ConditionColumn = 'SomeValue';
ColumnToUpdate
in YourTable1
with values from NewValue
in YourTable2
where a condition is met. To add a new column to an existing table, use the ALTER TABLE
command:
ALTER TABLE YourTableName ADD NewColumnName INT;
This adds a new column named NewColumnName
with an INT
data type to YourTableName
.
To delete duplicate rows while keeping one instance of each, you can use a Common Table Expression (CTE):
WITH CTE AS ( SELECT *, ROW_NUMBER() OVER (PARTITION BY Column1, Column2 ORDER BY (SELECT NULL)) AS rn FROM YourTableName ) DELETE FROM CTE WHERE rn > 1;
This CTE assigns a row number to each duplicate row and deletes all but the first instance.
To find duplicate rows based on certain columns, you can use a query with the GROUP BY
and HAVING
clauses:
SELECT Column1, Column2, COUNT(*) FROM YourTableName GROUP BY Column1, Column2 HAVING COUNT(*) > 1;
Replace Column1, Column2
with the columns you want to check for duplicates.
Use the following query to retrieve a list of all columns and their data types:
SELECT COLUMN_NAME, DATA_TYPE, CHARACTER_MAXIMUM_LENGTH FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME = 'YourTableName';
This will return all column names, data types, and their maximum length for the specified table.