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Documentation >> PostgreSQL 12
30.2. Subscription
created manually before the subscription can be activated. When dropping a subscription, the replication slot should be kept. This could be useful when the subscriber database
Documentation >> PostgreSQL 12
5.5. System Columns
creates a new row version for the same logical row.) cmin The command identifier (starting at zero) within the inserting transaction. xmax The identity (transaction ID) of the deleting transaction, or zero for an undeleted
Documentation >> PostgreSQL 12
PREPARE TRANSACTION
databases or other transactional resources. Unless you're writing a transaction manager, you probably shouldn't be using PREPARE TRANSACTION . This command must be used inside a transaction block. Use BEGIN to start
Documentation >> PostgreSQL 12
F.17. intagg
database systems have the notion of a one to many table. Such a table usually sits between two indexed tables, for example: CREATE
Documentation >> PostgreSQL 12
56.2. Foreign Data Wrapper Callback Routines
database object options. The FDW may ignore the local_schema field of the ImportForeignSchemaStmt , because the core server will automatically insert that name into the parsed CREATE
Documentation >> PostgreSQL 12
12.7. Configuration Example
database management system, is now undergoing beta testing of the next version of our software. '); The next step is to set the session to use the new configuration, which was created
Documentation >> PostgreSQL 12
5.6. Modifying Tables
create it again. But this is not a convenient option if the table is already filled with data, or if the table is referenced by other database
Documentation >> PostgreSQL 12
11.5. Combining Multiple Indexes
database developer must make trade-offs to decide which indexes to provide. Sometimes multicolumn indexes are best, but sometimes it's better to create
Documentation >> PostgreSQL 12
Chapter 7. Queries
create tables, how to fill them with data, and how to manipulate that data. Now we finally discuss how to retrieve the data from the database
Documentation >> PostgreSQL 12
G.2. Server Applications
creation of a PostgreSQL warm standby server This section covers PostgreSQL server-related applications in contrib . They are typically run on the host where the database
Documentation >> PostgreSQL 12
45.8. Explicit Subtransactions
database access as described in Section 45.7.2 can lead to an undesirable situation where some operations succeed before one of them fails, and after recovering from that error the data is left in an inconsistent
Documentation >> PostgreSQL 12
35.4. Using Host Variables
database back to the program, the C variables that are intended to contain this data need to be declared in specially marked sections, so the embedded SQL preprocessor is made aware of them. This section
Documentation >> PostgreSQL 12
15.4. Parallel Safety
CREATE AGGREGATE , the PARALLEL option can be specified with SAFE , RESTRICTED , or UNSAFE as the corresponding value. Functions and aggregates must be marked PARALLEL UNSAFE if they write to the database
Documentation >> PostgreSQL 12
Chapter 2. The SQL Language
Creating a New Table 2.4. Populating a Table With Rows 2.5. Querying a Table 2.6. Joins Between Tables 2.7. Aggregate Functions 2.8. Updates 2.9. Deletions Prev Up Next 1.4. Accessing a Database
Documentation >> PostgreSQL 12
31.1. What Is JIT compilation?
creating a function specific to the table layout and the number of columns to be extracted. 31.1.2. Inlining PostgreSQL is very extensible and allows new data types, functions, operators and other database