ALTER TABLE ADD CONSTRAINT gets Error 1064
Omit the parenthesis: ALTER TABLE User ADD CONSTRAINT userProperties FOREIGN KEY(properties) REFERENCES Properties(ID)
alter-table
Best way to add column with default value while under load
Performance depends on the Oracle version you use. Locks are generated anyway. If version <= Oracle 11.1 then #1 does the same as #2. It is slow anyway. Beginning with Oracle 11.2, Oracle introduced a great optimization for the first statement (one command doing it all). You don’t need to change the command – Oracle … Read more
Can you index tables differently on Master and Slave (MySQL)
I believe so. After replication is working, you can drop the indexes on the slave and create the indexes you want and that should do it. Since MySQL replicates statements and not data (at least by default), as long as the SQL necessary to insert or update or select from the table doesn’t need to … Read more
Best way to add a new column with an initial (but not default) value?
To add the column with a default and then delete the default, you can name the default: ALTER TABLE tbl ADD col INTEGER NOT NULL CONSTRAINT tbl_temp_default DEFAULT 1 ALTER TABLE tbl drop constraint tbl_temp_default This filled in the value 1, but leaves the table without a default. Using SQL Server 2008, I ran this … Read more
How do you ADD and DROP columns in a single ALTER TABLE
If you look at the ALTER TABLE SYTAX you’ll see this ALTER TABLE [ database_name . [ schema_name ] . | schema_name . ] table_name { ALTER COLUMN column_name { [ type_schema_name. ] type_name [ ( { precision [ , scale ] | max | xml_schema_collection } ) ] [ COLLATE collation_name ] [ NULL … Read more
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
How to add a boolean datatype column to an existing table in sql?
In SQL SERVER it is BIT, though it allows NULL to be stored ALTER TABLE person add [AdminApproved] BIT default ‘FALSE’; Also there are other mistakes in your query When you alter a table to add column no need to mention column keyword in alter statement For adding default constraint no need to use SET … Read more
What is the difference between “ADD KEY” and “ADD INDEX” in MySQL? [duplicate]
KEY is a synonym for INDEX. … | ADD {INDEX|KEY} [index_name] … Check the MySQL documentation for ALTER TABLE.
ALTER TABLE add constraint
Omit the parenthesis: ALTER TABLE User ADD CONSTRAINT userProperties FOREIGN KEY(properties) REFERENCES Properties(ID)
Add a column if it doesn’t exist to all tables?
You cannot use variables, like @tableName, in DDL. Besides, splinting the name into part and ignoring the schema can only result in bugs. You should just use the ”?” replacement in the SQL batch parameter and rely on the MSforeachtable replacement: EXEC sp_MSforeachtable ‘ if not exists (select * from sys.columns where object_id = object_id(”?”) … Read more