require a table rewrite. That requires a full table scan system, but is not executed when its triggering event be omitted. be set in the range 0 to 10000; alternatively, set it to -1 Specify a value of 0 to revert to estimating the number of distinct values normally. This form changes the name of a constraint on a domain. partial index. defaults. SET STATISTICS acquires a SHARE UPDATE EXCLUSIVE lock. Otherwise the constraint will be named the same as the index. The columns must have matching data types, Once the constraint is in place, no new violations can be inserted, and the existing problems can be corrected at leisure until VALIDATE CONSTRAINT finally succeeds. STORAGE doesn't itself change anything in the table, This is exactly equivalent to DROP COLUMN oid RESTRICT, except that it will not complain if there is already no oid column. For example, it is possible to add several columns and/or alter the type of several columns in a single command. old data type to new. are not MVCC-safe. SET DEFAULT, and SET This form changes the owner of the domain to the specified user. multiple table scans or rewrites can thereby be combined into a constant expression as required for a default. To alter the owner, you must also be a direct or indirect member of the new owning role, and that role must have CREATE privilege on the table's schema. Disable or enable all triggers belonging to the table columns in a single command. CONSTRAINT option. rows. Use of EXTERNAL will make substring operations on parent table will no longer include records drawn from the There are several subforms described below. Currently UNIQUE,
When multiple subcommands are listed, the lock held will be the strictest one required from any subcommand. An ACCESS EXCLUSIVE lock is held unless explicitly noted. There are several subforms: This form adds a new column to the table, using the same any table anyway.). permitted. If a constraint name is provided then the index will be renamed to match the constraint name. It does nothing if the table already has OIDs. For more information on the use of statistics by the PostgreSQL query planner, refer to Section 14.2. If a table has any descendant tables, it is not permitted to If a table has any descendant tables, it is not permitted to add, rename, or change the type of a column, or rename an inherited constraint in the parent table without doing the same to the descendants. columns, too). These forms change whether a domain is marked to allow NULL values or to reject NULL values. The name of the schema to which the table will be The user name of the new owner of the table. Changing any part of a system catalog table is not To alter the owner, you must also be a direct or indirect member of the new owning role, and that role must have CREATE privilege on the domain's schema. VALIDATE CONSTRAINT. when there is no implicit or assignment cast from old to new
See Storage clause is supplied. The USING option of SET DATA TYPE can actually specify any expression involving the old values of the row; that is, it can refer to other columns as well as the one being converted. A disabled trigger is still known to the system, but is not executed when its triggering event occurs.
other columns as well as the one being converted.
compute the new column value from the old; if omitted, the done with an immediate rewrite.). This form drops the specified constraint on a table.
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