postgresql常用的sql语句分享

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sql语句

15个常用的语句：
1.select relname,relpages from pg_class order by relpages desc
2.selecr pg_database_size('数据库名')
3.select pg_size_pretty(pg_total_relation_size('表名'))
4.\d 表名
5.create index name on table using index_type(colum)
6.rollback,commit
7.explain query
8.explain analyze query
9.insert into number(num) values (generate_series(1,1000))
10.select count(*) from table ,select count(col_name) from table,
select count(distinct 列名) from table
11.slect MAX(num) from number_table where num < (select MAX(num) from number_table)
12.select MIN(col_name) from number_table where num >(select MIN(num) from number_table)
13.select typname,typlen from pg_type where typtype = 'b'
14.\g output_file,select * from table_name,\g
15.加密：select crypt（'sathiys',gen_salt('md5'));
16.insert into WU(a1,b1) select generate_series(1,1000000),'aa';
17.select name,setting,short_desc from pg_settings where name like '%scan';

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