Logical Operators The usual logical operators are available: AND OR NOT SQL uses a three-valued logic system with true, false, and null, which represents “unknown”. Ob- serve the following truth tables: value for log_line_prefix, you should usually make its last character be a space, to provide visual separation from the rest of the log line. A punctuation character can be used too. Tip: Syslog produces its provided in the pg_standby module. It should be used as a reference on how to correctly implement the logic described above. It can also be extended as needed to support specific configurations and environments

Logical Operators The usual logical operators are available: AND OR NOT SQL uses a three-valued logic system with true, false, and null, which represents “unknown”. Observe the following truth tables: value for log_line_prefix, you should usually make its last character be a space, to provide visual separation from the rest of the log line. A punctuation character can be used too. Tip: Syslog produces its provided in the pg_standby module. It should be used as a reference on how to correctly implement the logic described above. It can also be extended as needed to support specific configurations and environments

types in queries. These rules provide useful shortcuts, but can be confusing if you don’t know the logic behind them. In PostgreSQL, a reference to a table name (or alias) in a query is effectively a reference Logical Operators The usual logical operators are available: AND OR NOT SQL uses a three-valued logic system with true, false, and null, which represents “unknown”. Ob- serve the following truth tables: value for log_line_prefix, you should usually make its last character be a space, to provide visual separation from the rest of the log line. A punctuation character can be used too. Tip: Syslog produces its

types in queries. These rules provide useful shortcuts, but can be confusing if you don’t know the logic behind them. In PostgreSQL, a reference to a table name (or alias) in a query is effectively a reference Logical Operators The usual logical operators are available: AND OR NOT SQL uses a three-valued logic system with true, false, and null, which represents “unknown”. Observe the following truth tables: value for log_line_prefix, you should usually make its last character be a space, to provide visual separation from the rest of the log line. A punctuation character can be used too. Tip: Syslog produces its

types in queries. These rules provide useful shortcuts, but can be confusing if you don’t know the logic behind them. In PostgreSQL, a reference to a table name (or alias) in a query is effectively a reference Logical Operators The usual logical operators are available: AND OR NOT SQL uses a three-valued logic system with true, false, and null, which represents “unknown”. Ob- serve the following truth tables: value for log_line_prefix, you should usually make its last character be a space, to provide visual separation from the rest of the log line. A punctuation character can be used too. Tip: Syslog produces its

types in queries. These rules provide useful shortcuts, but can be confusing if you don’t know the logic behind them. In PostgreSQL, a reference to a table name (or alias) in a query is effectively a reference Logical Operators The usual logical operators are available: AND OR NOT SQL uses a three-valued logic system with true, false, and null, which represents “unknown”. Observe the following truth tables: value for log_line_prefix, you should usually make its last character be a space, to provide visual separation from the rest of the log line. A punctuation character can be used too. Tip: Syslog produces its

Operators The usual logical operators are available: AND OR NOT SQL uses a three-valued Boolean logic where the null value represents “unknown”. Observe the following truth tables: a b a AND b a OR b trans- actions might be significant, this mode is recommended only when updating transactions contain logic sufficiently complex that they might give wrong answers in Read Committed mode. Most commonly, Serializable value for log_line_prefix, you should usually make its last character be a space, to provide visual separation from the rest of the log line. A punctuation character could be used too. Tip: Syslog produces

Operators The usual logical operators are available: AND OR NOT SQL uses a three-valued Boolean logic where the null value represents “unknown”. Observe the following truth tables: a b a AND b a OR b transactions might be significant, this mode is recommended only when updating transac- tions contain logic sufficiently complex that they might give wrong answers in Read Committed mode. Most commonly, Serializable value for log_line_prefix, you should usually make its last character be a space, to provide visual separation from the rest of the log line. A punctuation character could be used too. Tip: Syslog produces

Operators The usual logical operators are available: AND OR NOT SQL uses a three-valued Boolean logic where the null value represents “unknown”. Observe the following truth tables: a b a AND b a OR b transactions can be significant, serializable mode is recommended only when updating transactions contain logic sufficiently complex that they might give wrong answers in Read Com- mitted mode. Most commonly, Serializable value for log_line_prefix, you should usually make its last character be a space, to provide visual separation from the rest of the log line. A punctuation character could be used too. Tip: Syslog produces

Operators The usual logical operators are available: AND OR NOT SQL uses a three-valued Boolean logic where the null value represents “unknown”. Observe the following truth tables: a b a AND b a OR b tions can be significant, serializable mode is recommended only when updating transactions contain logic sufficiently complex that they might give wrong answers in Read Committed mode. Most commonly, Serializable value for log_line_prefix, you should usually make its last character be a space, to provide visual separation from the rest of the log line. A punctuation character could be used too. Tip: Syslog produces