mysqldump -u user_name -p database_name table_name > outfile_name.sql 3.导出一个数据库结构 mysqldump -u user_name -p -d –add-drop-table database_name > outfile_name.sql -d 没有数据 –add-drop-table 在每个create语句之前增加一个drop table 4.带语言参数导出 mysqldump -uroot -p –def...
has_table_privilege(user,table,privilege) 用户是否有访问表的权限 SELECT/INSERT/UPDATE/DELETE/RULE/REFERENCES/TRIGGER has_table_privilege(table,privilege) 当前用户是否有访问表的权限 SELECT/INSERT/UPDATE/DELETE/RULE/REFERENCES/TRIGGER has_database_privilege(user,database,privilege) 用户是否有访问数据库...
select count(1) from information_schema.columns where table_name='mny_draw_record' and table_schema='GPO' group by table_name;" --自关联删除重复记录: delete from mny_com_record a using (select order_no,max(com_record_id) as id from mny_com_record group by order_no) b where a.orde...
代码语言:txt 复制 CREATE TABLE your_table ( id UUID DEFAULT uuid_generate_v4() PRIMARY KEY, -- other columns ); 确保你已经安装了uuid-ossp扩展。可以使用以下语句在Postgres中安装该扩展: 代码语言:txt 复制 CREATE EXTENSION IF NOT EXISTS "uuid-ossp"; 现在,你可以为UUID主键列设置默认值。使用...
问tokio_postgres中的Rust和PostgreSQLEN在使用 PostgreSQL 时，使用类似 SUM(vals) 或者 AVG(vals) 是...
Additional metric maps can be easily created from Postgres documentation by copying the tables and using the following Python snippet:x = """tab separated raw text of a documentation table""" for l in StringIO(x): column, ctype, description = l.split('\t') print """{0}" : {{ prome...
theDOCUMENTtable first, join them with the data from theDOCUMENT_DEBITtable and then calculate the aggregates. Let’s rewrite the query and create additional indexes, so PostgreSQL could useIndex Only Scanaccess method allowing to retrieve data from the index and not from the table which reduces...
Based on our operating experience, below we give an extensive comparison between Postgres and MySQL from the following dimensions: License Connection Model Performance Features Object Hierarchy ACID Transaction Security Query Optimizer Online DDL Replication JSON CTE (Common Table Expression) Window Function...
$postgres_query SQL query, as seen byPostgreSQLdatabase. Sample configurations Sample configuration #1 Return content of tablecats(inrdsformat). http { upstream database { postgres_server 127.0.0.1 dbname=test user=test password=test; } server { location / { postgres_pass database; postgres_quer...
The PostgreSQL 16 query planner will now consider usingMemoizewhen aUNION ALLquery appears on the inner side of a parameterizedNested Loop. -- SetupCREATETABLEt1(aINTPRIMARYKEY);CREATETABLEt2(aINTPRIMARYKEY);CREATETABLElookup(aINT);INSERTINTOt1SELECTxFROMgenerate_Series(1...