Differentiate between commit and checkpoint.Īre you preparing for your SQL developer interview? Does PostgreSQL support full text search? How will you take backup of the database in PostgreSQL? How do you perform case-insensitive searches using regular expressions in PostgreSQL? What is the main disadvantage of deleting data from an existing table using the DROP TABLE command? What can you tell about WAL (Write Ahead Logging)? How do you check the rows affected as part of previous transactions? What do you understand by command enable-debug? What do you understand by multi-version concurrency control? Can you explain the architecture of PostgreSQL? What are ACID properties? Is PostgreSQL compliant with ACID? How can you delete a database in PostgreSQL? How can you get a list of all databases in PostgreSQL? What is the capacity of a table in PostgreSQL? What is the importance of the TRUNCATE statement? What are partitioned tables called in PostgreSQL? How can we start, restart and stop the PostgreSQL server? What is the command used for creating a database in PostgreSQL? How will you change the datatype of a column? How to create empty tables with the same structure as another table? What is Collation? What are the different types of Collation Sensitivity? What are the differences between OLTP and OLAP? What is User-defined function? What are its various types? What is the difference between DELETE and TRUNCATE statements? What is the difference between DROP and TRUNCATE statements? What are the TRUNCATE, DELETE and DROP statements? What are the various forms of Normalization? List the different types of relationships in SQL. What are UNION, MINUS and INTERSECT commands? What are some common clauses used with SELECT query in SQL? What is the difference between Clustered and Non-clustered index? What is an Index? Explain its different types. What is a Join? List its different types. What is the difference between SQL and MySQL? What is RDBMS? How is it different from DBMS? In this tutorial, you have learned how to use the SQL Server ALTER TABLE ADD statement to add one or more columns to a table. The following statement adds two new columns named amount and customer_name to the sales.quotations table: ALTER TABLE sales.quotations To add a new column named description to the sales.quotations table, you use the following statement: ALTER TABLE sales.quotations The following statement creates a new table named sales.quotations: CREATE TABLE sales.quotations ( SQL Server ALTER TABLE ADD column examples Note that SQL Server doesn’t support the syntax for adding a column to a table after an existing column as MySQL does. In this syntax, you specify a comma-separated list of columns that you want to add to a table after the ADD clause. If you want to add multiple columns to a table at once using a single ALTER TABLE statement, you use the following syntax: ALTER TABLE table_nameĬolumn_name_1 data_type_1 column_constraint_1,Ĭolumn_name_2 data_type_2 column_constraint_2,Ĭolumn_name_n data_type_n column_constraint_n Second, specify the name of the column, its data type, and constraint if applicable.First, specify the name of the table in which you want to add the new column.The following ALTER TABLE ADD statement appends a new column to a table: ALTER TABLE table_nameĪDD column_name data_type column_constraint Ĭode language: SQL (Structured Query Language) ( sql ) Summary: in this tutorial, you will learn how to use SQL Server ALTER TABLE ADD statement to add one or more columns to a table.
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