drop index if exists "t_user_pkey"; alter table "t_user" add constraint "t_user_pkey" primary key ("ID"); 根据已有表结构创建表 create table if not exists 新表 (like 旧表 including indexes including comments including defaults); 删除表 drop table if exists "t_template" cascade; 查询注...
包括行：在MySQL中，无论是Innodb还是MyIsam，都使用了B+树作索引结构(这里不考虑hash等其他索引)。
CREATE INDEX IF NOT EXISTS "post_body_index" ON "Posts" USING GIN (to_tsvector('english', "body")); -- Or/And CREATE INDEX IF NOT EXISTS "post_body_index" ON "Posts" USING GIST (to_tsvector('english', "body")); And request should be something like this SELECT "public"."Posts"...
-- 创建子分区表 startTime := curMM||'01 00:00:00.000'; endTime := to_char( startTime::timestamp + interval '1 month', 'YYYY-MM-DD HH24:MI:'); strSQL := 'CREATE TABLE IF NOT EXISTS '||TG_RELNAME||'_'||curMM|| ' ( CHECK('||time_column_name||'>='''|| startTime ...
问Postgres:如果不存在，则创建表⇒23505EN1. 创建表，提示已经存在 [root@node1]# hbase shell ...
--Create Users tableCREATE TABLE IF NOT EXISTS users( id bigserial NOT NULL, name character varying(100) NOT NULL,rating integer,PRIMARY KEY (id));CREATE INDEX usr_rating_idxON users USING btree(rating ASC NULLS LAST)TABLESPACE pg_default;--Create Stories tableCREATE TABLE IF NOT EXISTS...
create index idx_emp_no on salaries(emp_no); 解答:SELECT * FROM salaries INDEXED BY idx_emp_no WHERE emp_no = 10005 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 7.添加一列 题目描述 存在actor表,包含如下列信息: CREATE TABLE IF NOT EXISTS actor ( ...
create tableifnotexists name_age ( info jsonb ) 插入数据 插入数据可以直接以json格式插入: insert into name_age values('{"id":1,"name":"小明", "age":18}') 在json里插入新的key值gender,如下: SELECT info||'{"gender":"男"}'::jsonbfromname_age where (info->>'id')::int4 = 1 ...
CREATE INDEX usr_rating_idx ON users USING btree (rating ASC NULLS LAST) TABLESPACE pg_default ; --Create Stories table CREATE TABLE IF NOT EXISTS stories ( id bigserial NOT NULL, create_date timestamp without time zone NOT NULL,
namecharactervarying(100)NOTNULL, ratinginteger,PRIMARYKEY (id) ) ;CREATEINDEX usr_rating_idxONusersUSINGbtree (ratingASCNULLSLAST) TABLESPACE pg_default ;--Create Stories tableCREATETABLEIFNOTEXISTSstories ( id bigserialNOTNULL, create_datetimestampwithouttimezoneNOTNULL, ...