在PostgreSQL中,你可以使用CREATE TABLE IF NOT EXISTS语法来创建一个新表,如果该表尚不存在的话。这个语法可以避免在尝试创建已存在的表时发生错误。以下是如何使用这一语法的详细步骤: 检查数据库连接是否正常: 在执行任何SQL语句之前,确保你的数据库连接是正常的。这通常涉及到提供正确的数据库连接参数(如主机名...
CREATETABLEIFNOTEXISTSpublic.pro_salary_quota ( idvarchar(50)NOTNULL,-- 主键Id working_process_type int4NOTNULL,-- 工序类型:1-构件工序,2-零件工序 working_process_idvarchar(50)NULL,-- 工序id valuation_unit int4NOTNULL,-- 核价单位 unit_pricenumeric(20,2)NOTNULL,-- 单位单价 factory_idvarc...
CREATE [ UNIQUE ] INDEX [ CONCURRENTLY ] [ [ IF NOT EXISTS ] name ] ON table_name [ USING method ] ( { column_name | ( expression ) } [ COLLATE collation ] [ opclass ] [ ASC | DESC ] [ NULLS { FIRST | LAST } ] [, ...] ) [ WITH ( storage_parameter = value [, ......
CREATE TABLE IF NOT EXISTS dept ( deptno SERIAL PRIMARY KEY, -- 部门编号,自动递增主键 dname VARCHAR(20) NOT NULL, -- 部门名称,非空字段 loc VARCHAR(20) -- 部门位置 ); -- 如果员工表不存在,则创建员工表(emp),包含员工编号、姓名、职务、上级编号、入职日期、薪资等信息 CREATE TABLE IF NOT ...
# 创建新表 CREATE TABLE IF NOT EXISTS dictionary(english VARCHAR(30), chinese VARCHAR(80), times SMALLINT, in_new_words SMALLINT); # 插入数据 INSERT INTO dictionary(english, chinese, times, in_new_words) VALUES('hello', '你好', 0, 0); # 选择记录 SELECT * FROM dictionary WHERE englis...
IF NOT EXISTS(SELECT 1 FROM sys.symmetric_keys k WHERE ='##MS_DatabaseMasterKey##')BEGIN CREATE MASTER KEY ENCRYPTION BY PASSWORD = 'pa$$w0rd'; end /* 删除主密钥 USE master; DROP MASTER KEY */ 2.创建证书并使用主密钥加密 USE master ...
ENPG数据库和应用之间常见的部件有连接池、负载平衡组件、路由、防火墙等。我们常常不在意或者认为涉及的...
table_name; IF NOT FOUND THEN RETURN; END IF; v_sql=' SELECT pg_attribute.attname AS fields_name, pg_attribute.attnum AS fields_index, pgsql_type(pg_type.typname::varchar) AS fields_type, pg_attribute.atttypmod-4 as fields_length, CASE WHEN pg_attribute.attnotnull THEN ''not null...
-f FILE, --file FILE Location of configuration file (default:mysql2pgsql.yml). If none exists at that path, one will be created for you. -V, --version Print version and exit. https://github.com/philipsoutham/py-mysql2pgsql ...
create sequence if not exists inf_topology_node_device_id_seq increment by 1 minvalue 1 no maxvalue start with 1; nextval('inf_topology_node_device_id_seq'::regclass) //查询序列 SELECT c.relname FROM pg_class c WHERE c.relkind ='S'; 函数 CREATE OR REPLACE FUNCTION merge_db(key1 ...