·IsNull(check_expression,replacement_value)对check_expression进行检测,如果值为空,函数将返回replacement_value。如果 check_expression值非空,该函数将返回check_expression。 ---------------------------------------------------
ISNULL(price, $10.00); 等价于:Case WHEN Expression1 is NULL Then Expression2 ELSE Expression1。 31. isdate(expression) :确定输入表达式是否为有效的日期如果输入表达式是有效的日期,那么 ISDATE 返回 1;否则,返回 0 32. isnumeric(expression) :确定表达式是否为一个有效的数字类型。当输入表达式得数为一...
array_to_string(spcacl, E'\n') AS "Access privileges(访问权限)" --,spcoptions AS "Options(参数)" ,pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS "Size(表空间大小)" --,pg_catalog.shobj_description(oid, 'pg_tablespace') AS "Description(备注)" from pg_catalog.pg...
{ "numeric_value_out_of_range", ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE }, { "sequence_generator_limit_exceeded", ERRCODE_SEQUENCE_GENERATOR_LIMIT_EXCEEDED }, { "string_data_length_mismatch", ERRCODE_STRING_DATA_LENGTH_MISMATCH }, { "string_data_right_truncation", ERRCODE_STRING_DATA_RIGHT_...
standard_planner(Query *parse, const char *query_string, int cursorOptions, ParamListInfo boundParams) { ... /* Determine what fraction of the plan is likely to be scanned */ if (cursorOptions & CURSOR_OPT_FAST_PLAN) { /* * We have no real idea how many tuples the user will ultim...
# "local" is for Unix domain socket connections only local all all trust # IPv4 local connections: host all all 127.0.0.1/32 trust host all all ::1/128 trust 生成密钥文件(建议在一个节点上修改完再发到其他节点) echo 'some string' > ~/.pgpoolkey ...
# These are only used if logging_collector is on: log_directory (string) 这个参数只能在postgresql.conf文件中被设置。它决定存放数据库运行日志文件的目录。默认值是pg_log。可以是绝对路径,也可是相对路径(相对于数据库文件所在的路径)。 log_filename (string) ...
check_function_bodies = on #default_transaction_isolation = 'read committed' #default_transaction_read_only = off #default_transaction_deferrable = off #session_replication_role = 'origin' #statement_timeout = 0 # in milliseconds, 0 is disabled #lock_timeout = 0 # in milliseconds, 0 is ...
citus.remote_task_check_interval (integer) 设置Azure Cosmos DB for PostgreSQL 检查任务跟踪器执行程序所管理作业的状态的频率。 默认值为 10 毫秒。 协调器将任务分配给工作器,然后定期在工作器上检查每个任务的进度。 此配置值设置每两次后续检查的时间间隔。 此参数在协调器上生效,可在运行时设置。
A null value is treated as an empty string. I treats the argument value as an SQL identifier, double-quoting it if necessary. It is an error for the value to be null (equivalent to quote_ident). L quotes the argument value as an SQL literal. A null value is displayed as the string...