--判断表格是否存在,不存在则返回结果为nullselectdistincttable_namefrominformation_schema.columnswheretable_schema='schemaName'andtable_name='tableName';--根据表格是否存在,进行删除操作droptableifexists'schemaName'.'tableName';--根据表格是否存在,进行创建操作createtableifnotexistsstudent ( idint, nameVARCH...
–建表 DROP TABLE IF EXISTS "lianxi"."emp";--删除原有的emp表 -- 创建emp表 CREATE TABLE "lianxi"."emp" ( "empno" int4 NOT NULL, "ename" varchar(30) COLLATE "pg_catalog"."default", "job" varchar(30) COLLATE "pg_catalog"."default", "mgr" int4, "hiredate" date, "sal" numer...
1、建表语句 DROP TABLE IF EXISTS "public"."json_param"; CREATE TABLE "public"."json_param" ( "id" int4 NOT NULL, "json" text COLLATE "pg_catalog"."default" ); INSERT INTO "public"."json_param" VALUES (1, '{"name":"xinglei","age":20,"grade":{"math":80,"english":90},"...
pgsql常⽤的建表语句DROP TABLE IF EXISTS "public"."xxxxxx";DROP SEQUENCE IF EXISTS "public"."xxxxxx_id_seq";CREATE SEQUENCE "public"."xxxxxx_id_seq"INCREMENT 1 MINVALUE 1 MAXVALUE 2147483647 START 1 CACHE 1;CREATE TABLE "public"."xxxxxx" ("id" int4 NOT NULL DEFAULT nextval('xxx...
DROP TABLE if EXISTS "test"."testtable"; CREATE TABLE "test"."testtable" ( "id" int4 DEFAULT nextval('testseq_id_seq'::regclass) NOT NULL, -- 表数据关联SEQUENCE,每次插入取nextval('testseq_id_seq')<prename="code"class="sql"><prename="code"class="sql">nextval('testseq_id_seq'...
# 创建表CREATETABLECOMPANY(IDINTPRIMARYKEYNOTNULL,NAMETEXTNOTNULL,AGEINTNOTNULL,ADDRESSCHAR(50),SALARYREAL);# 删除表droptableifexistscompany;# 列举表,相当于mysql的show tables\d# 查看表结构,相当于desc tblname,show columns from tbname\d company# 查看索引\di ...
DROP TABLE If Exists temp.mjp_temp_update_log 应⽤例⼦：SELECT ids,code,INTO TEMP TABLE tmp0 FROM TEMP .m_product_x WHERE TEMP .m_product_x.ids = ''GROUP BY TEMP .m_product_x.code,TEMP .m_product_x.ids;CREATE INDEX idx_tmp0_inner_cd ON tmp0 (code);SELECT * FROM TEMP...
ALTERTABLEuser_tbl RENAME COLUMN signup_date TO signup; --删除栏位 ALTERTABLEuser_tblDROPCOLUMN email; --表格更名 ALTERTABLEuser_tbl RENAME TO backup_tbl; --删除表格 DROPTABLEIF EXISTS backup_tbl; 1. 2. 3. 4. 5. 6. 7. 8.
// 删除前先解除 id 对该序列的依赖 ALTER TABLE tablename ALTER COLUMN id SET DEFAULT null; DROP SEQUENCE IF EXISTS sequence_name; // 这里的 id_max 即 id 目前的最大值,可通过 “SELECT MAX(id) FROM tablename” 得到 CREATE SEQUENCE sequence_name START WITH id_max; ALTER TABLE tablename ...
drop table if exists tb1;在postgresql中，循环设置已存在的某列(num)值为0-9，可以⽤以下⽅法：//将表tb按name排序，利⽤row_number() over()查询序号并将该列命名为rownum，创建新表tb1并将结果保存到该表中 create table tb1 as (select *, row_number() over(order by name) as rownum from...