Change which psql

For a deferred trigger, the enable status is checked when the event occurs, not when the trigger function is actually executed. One can disable or enable a single trigger specified by name, or all triggers on the table, or only user triggers this option excludes internally generated constraint triggers such as those that are used to implement foreign key constraints or deferrable uniqueness and exclusion constraints.

Disabling or enabling internally generated constraint triggers requires superuser privileges; it should be done with caution since of course the integrity of the constraint cannot be guaranteed if the triggers are not executed.

Simply enabled triggers will fire when the replication role is "origin" the default or "local". These forms configure the firing of rewrite rules belonging to the table. A disabled rule is still known to the system, but is not applied during query rewriting. This configuration is ignored for ON SELECT rules, which are always applied in order to keep views working even if the current session is in a non-default replication role.

It does not actually re-cluster the table. This affects future cluster operations that don't specify an index. This form adds an oid system column to the table see Section 5. It does nothing if the table already has OIDs. This form removes the oid system column from the table. This form changes one or more storage parameters for the table. See Storage Parameters for details on the available parameters.

Note that the table contents will not be modified immediately by this command; depending on the parameter you might need to rewrite the table to get the desired effects. This form resets one or more storage parameters to their defaults. As with SET , a table rewrite might be needed to update the table entirely. This form adds the target table as a new child of the specified parent table. Subsequently, queries against the parent will include records of the target table.

To be added as a child, the target table must already contain all the same columns as the parent it could have additional columns, too. This form removes the target table from the list of children of the specified parent table. Queries against the parent table will no longer include records drawn from the target table. The table's list of column names and types must precisely match that of the composite type; the presence of an oid system column is permitted to differ.

The table must not inherit from any other table. This form changes the table's tablespace to the specified tablespace and moves the data file s associated with the table to the new tablespace. The RENAME forms change the name of a table or an index, sequence, or view or the name of an individual column in a table. There is no effect on the stored data.

This form moves the table into another schema. Associated indexes, constraints, and sequences owned by table columns are moved as well. This is particularly useful with large tables, since only one pass over the table need be made. To add the table as a new child of a parent table, you must own the parent table as well.

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.

These restrictions enforce that altering the owner doesn't do anything you couldn't do by dropping and recreating the table. However, a superuser can alter ownership of any table anyway. The name optionally schema-qualified of an existing table to alter.

If ONLY is specified before the table name, only that table is altered. Here is its syntax. In the above command, you need to specify the username whose password you want to change, and also the new password for that user. Replace testuser and newpassword with. Similarly, if you want to change password for postgres user, modify the above command as shown.

Sometimes you may need to expire a password after a specific date. Need a reporting tool for PostgreSQL? When using FROM you should ensure that the join produces at most one output row for each row to be modified. In other words, a target row shouldn't join to more than one row from the other table s.

If it does, then only one of the join rows will be used to update the target row, but which one will be used is not readily predictable. Because of this indeterminacy, referencing other tables only within sub-selects is safer, though often harder to read and slower than using a join.

Change the word Drama to Dramatic in the column kind of the table films :. Adjust temperature entries and reset precipitation to its default value in one row of the table weather :.

Increment the sales count of the salesperson who manages the account for Acme Corporation, using the FROM clause syntax:. Attempt to insert a new stock item along with the quantity of stock. If the item already exists, instead update the stock count of the existing item.

To do this without failing the entire transaction, use savepoints:. According to the standard, the column-list syntax should allow a list of columns to be assigned from a single row-valued expression, such as a sub-select:. Be careful when porting applications that use this extension. Development Versions: devel.