format('ALTER TABLE tab ATTACH PARTITION tab_%s FOR VALUES IN (%L)', dateStr, dateStr); RETURN1; END; $$; CREATE EXTENSION pg_cron; SELECT cron.schedule('0 14 * * *',$$SELECT create_tab_part();$$); 使用专门的分区管理插件,如 pg_partman 以pg_partman 为例,每天提前创...
CREATE TABLE part_list ( city_id int not null, name varchar(30), population int) PARTITION BY LIST (name);Create index part_list_idx on part_list (name);\d+ part_range 2、创建分区表 CREATE TABLE p1_list PARTITION OF part_list FOR VALUES IN ('fujian', 'zhejiang');CREATE TABLE p2_...
\dew[+] [PATTERN] list foreign-data wrappers \df[antw][S+] [PATRN] list [only agg/normal/trigger/window] functions \dF[+] [PATTERN] list text search configurations \dFd[+] [PATTERN] list text search dictionaries \dFp[+] [PATTERN] list text search parsers \dFt[+] [PATTERN] list te...
[ GROUP BY expression [, ...] ] [ HAVING condition [, ...] ] [ { UNION | INTERSECT | EXCEPT } [ ALL ] select ] [ ORDER BY expression [ ASC | DESC | USING operator ] [, ...] ] [ LIMIT { count | ALL } ] [ OFFSET start ] [ FOR UPDATE [ OF table_name [, ...] ...
SELECT id, title FROM question_test WHERE q_bank_type=8 AND question_type =1 ORDER BY RAND() LIMIT 5; 1. 2. Three/Explain:无 Three/Image: Four/Sql:1.耗时位于性能杀手排行榜榜末 2.测试十次耗时:100.854251 70.259152 117.024592 76.072386 74.670738 74.066505 73.781441 43.795168 83.694435 84.508763...
SELECT * FROM machines WHERE ip_address IN (VALUES('192.168.0.1'::inet), ('192.168.0.10'), ('192.168.1.43')); Tip: For simpletests, it's better to rely on the list-of-scalars form ofINthan to write aVALUES Compatibility VALUESconforms to the SQL standard.LIMITandOFFSETare...
unix_socket_directories = '.' # comma-separated list of directories shared_buffers = 194GB # 尽量用数据库管理内存,减少双重缓存,提高使用效率 huge_pages = on # on, off, or try ,使用大页 work_mem = 256MB # min 64kB , 减少外部文件排序的可能,提高效率 ...
REPLACE [LOW_PRIORITY | DELAYED][INTO] tbl_name[PARTITION (partition_name [, partition_name] ...)][(col_name [, col_name] ...)]{ {VALUES | VALUE} (value_list) [, (value_list)] ...|VALUES row_constructor_list} 例子：mysql> CREATE TABLE test (-> id INT UNSIGNED NOT NULL AUTO...
SELECTformat('INSERT INTO %I VALUES(%L)','locations', E'C:\\Program Files'); 结果:INSERT INTO locationsVALUES(E'C:\\Program Files') 下面是使用width域和-标志的例子: SELECTformat('|%10s|','foo'); 结果:| foo| SELECTformat('|%-10s|','foo'); ...
CREATETABLEtable_name(...){PARTITIONBY{RANGE|LIST}({column_name|(expression)} 创建主表时须指定分区方式,可选的分区方式为RANGE范围分区或LIST列表分区,并指定字段或表达式作为分区键。 创建分区的语法如下: 代码语言:javascript 复制 CREATETABLEtable_namePARTITIONOFparent_table[()]FORVALUESpartition_bound_spec...