Do I need to create separate index for primary key of relational database table
You don’t need to. The primary key is already an index.
create-table
Mysql set default value to a json type column
From version 8.0.13 onwards, the documentation says (emphasis is mine): The BLOB, TEXT, GEOMETRY, and JSON data types can be assigned a default value only if the value is written as an expression, even if the expression value is a literal. You can make your default an expression by surrounding the literal value with parentheses: … Read more
PostgreSQL: Create table if not exists AS
CREATE TABLE AS is considered a separate statement from a normal CREATE TABLE, and until Postgres version 9.5 (see changelog entry) didn’t support an IF NOT EXISTS clause. (Be sure to look at the correct version of the manual for the version you are using.) Although not quite as flexible, the CREATE TABLE … LIKE … Read more
Cannot create a new table after “DROP SCHEMA public”
The error message pops up when none of the schemas in your search_path can be found. Either it is misconfigured. What do you get for this? SHOW search_path; Or you deleted the public schema from your standard system database template1. You may have been connected to the wrong database when you ran drop schema public … Read more
Creating new table with SELECT INTO in SQL [duplicate]
The syntax for creating a new table is CREATE TABLE new_table AS SELECT * FROM old_table This will create a new table named new_table with whatever columns are in old_table and copy the data over. It will not replicate the constraints on the table, it won’t replicate the storage attributes, and it won’t replicate any … Read more
postgres: create table in database from the command line
After the create database command issue a connect: create database sinfonifry owner sinfonifry; \connect sinfonifry
SQLite Foreign Key
You still have to create the column checklist_id INTEGER before you add it as a Foreign key. So it would be: CREATE TABLE checklist ( _id INTEGER PRIMARY KEY AUTOINCREMENT, checklist_title TEXT, description TEXT, created_on INTEGER, modified_on INTEGER ); CREATE TABLE item ( _id INTEGER PRIMARY KEY AUTOINCREMENT, checklist_id INTEGER, item_text TEXT, item_hint TEXT, item_order … Read more
How to create a table in a particular database?
You can specify the DB Name in the same query: CREATE TABLE database_name.table_name ( column_name1 data_type, column_name2 data_type, column_name3 data_type, …. )
How do I create a table based on another table [duplicate]
There is no such syntax in SQL Server, though CREATE TABLE AS … SELECT does exist in PDW. In SQL Server you can use this query to create an empty table: SELECT * INTO schema.newtable FROM schema.oldtable WHERE 1 = 0; (If you want to make a copy of the table including all of the … Read more
Create hive table using “as select” or “like” and also specify delimiter
Create Table as select (CTAS) is possible in Hive. You can try out below command: CREATE TABLE new_test row format delimited fields terminated by ‘|’ STORED AS RCFile AS select * from source where col=1 Target cannot be partitioned table. Target cannot be external table. It copies the structure as well as the data Create … Read more